In Valkyria Chronicles after you complete the Initial Cutscene for Chapter 03: Vasel Urban Warefare, the HeadQuarters is unlocked with 4 different locations available immediately to use.



Barracks
This is Valkyria Chronicle's equip and inventory screen, allowing a soldier's stats and Potentials to be checked, and weapons swapped out with any others available for their class.



Command Room

This is where the roster of recruits can be checked over and the composition of the team altered. A recruit's Potentials can be be viewed here, though this is limited to their Personal Potentials; the only way to determine their Battle Potentials is to put them on the squad roster and then check them in the barracks tab.

New recruits are gradually added to the roster throughout the game; the order is randomised. Certain recruits, however, can only be unlocked under special conditions.



Training Field
This area allows Experience to be allocated to level up the various infantry classes, unlocking new potential stats or Squad Leader Orders



Research & Development Facility

A Facility allowing the player to spend their Ducats on upgrading weapons & armour for infantry and buying parts for tanks, which the guide will be focused on. Parts & Weapons are gradually unlocked over the course of the game.

Tank Upgrades are purchasable in the Research & Development Section of Headquarters, gradually becoming available as you progress through the campaign. Three Special parts are held by enemy Tank Aces (Elite Units). Tank Upgrades come in two different versions:



General Upgrades

General Upgrades are a tank's equivalent of infantry levels, Edelweiss containing upgrades to the body, armour and gun while the Shamrock has Body, armour and three seperate turets which are upgraded individually. The Edelweiss has three 'uiltimate' upgrades to the gun, body and armour but only one can be fitted at a time.



Opitional Part Upgrades

Both the Edelweiss and Shamrock have a grid assigned to Optional System Parts which are accessible via the "Outfit Tank" Option in the R&D Facility Menu and each part takes up a set number of squares on the grid. Generally, the more powerful the part is, the larger it will be. Any number of parts can be taken provided they can be fit into the tanks Grid. Parts cannot be interchanged between tanks; Both the Shamrock and the Edelweiss has a seperate set, with parts for the Shamrock tending to be larger than parts for the Edelweiss with the same effect while also being more expensive.

Block Sizes are given as width X height. Edelweiss starts with a 4x3 upgrade grid that is upgraded to 5x4 when the Reinforced Body upgrade is purchased. Shamrock's upgrade grid is alway's 3x4.

Gun Upgrades

These upgrade each of Edelweiss primary weapons, also changing the name of the weapon on the outfit screen.

• Barrel Protector:
  Effect: Main gun range +200
  Cost: 1,500 Ducat
  
• Anti-Armour Rounds:
  Effect: Main gun +60 vs Person, +200 vs Armour
  Cost: 4,200 Ducat
  
• Increased Payload:
  Effect: Mortar +120 vs Person, +50 vs Armour, +10 Blast
  Cost: 7,700 Ducat
  
• Enhanced Gun:
  Effect: Machine gun +13 vs Person , +9 vs Armour
  Cost: 11,700 Ducat
  
• Reinforced Barrel:
  Effect: Main gun range +200
  Cost: 16,300 Ducat
  
• Heavy Tank Gun:
  Effect: Machine gun +12 vs Person, +7 vs Armour
  Cost: 21,300 Ducat
  
• Piercing Rounds:
  Effect: Main gun +60 vs Person, +200 vs Armour
  Cost: 26,800 Ducat
  
• Improved Shrapnel:
  Effect: Mortar +130 vs Person, +50 vs Armour, +20 Blast
  Cost: 32,600 Ducat
  
• Ragnite Rounds:
  Effect: Main gun +60 vs Person, +300 vs Armour
  Cost: 38,800 Ducat
  
• Extended Barrel (final upgrade)
  Effect: Main gun range +100
  Cost: 45,300 Ducat

Body Upgrades

Upgrades to the body, improving hitpoints and treadmill defence. Defence is subtracted from damage of all incoming attacks before any hitpoints are deducted. If the total defence rating is higher than damage dealt then the attack deals no damage to hitpoints at all. For example, if the Edelweiss' tread defence is 150 and it is hit by three attacks dealing 150 damage, it will lose no tread hitpoints; if it is hit by three attacks dealing 151 damage, it will only lose 3 tread hitpoints.

• Additional Armour:
  Effect: Body HP +300, Tread HP +200, Tread Def +50
  Cost: 1,700 Ducat
  
• Rivet Construction:
  Effect: Body HP +100
  Cost: 7,100 Ducat
  
• Reinforced Body:
  Effect: Body HP +300, Tread HP +200, Tread Def +50, AP +100, part grid enlarged to 5 x 4
  Cost: 13,800 Ducat
  
• Point Soldering:
  Effect: Body HP +100
  Cost:21,400 Ducat
  
• Plane Soldering:
  Effect: Body HP +100
  Cost:29,600 Ducat
  
• Reinforced Armour (final upgrade)
  Effect: Body HP +300, Tread HP +200, Tread Def +50
  Cost: 34,000 Ducat

Reinforced Armour is probably the best all-around upgrade of the three "final" upgrades; +100 range isn't really worth the cost (for reference, the range of a hand grenade is 90), and it would take ten separate hits for body defence +30 to save 300 HP of damage.

Armour Upgrades
Upgrades to the body's defence rating.

• Frontal Armour:
  Effect: Body Def +30
  Cost: 1,200 Ducat
  
• Rolled Steel:
  Effect: Body Def +20
  Cost: 3,300 Ducat
  
• Turret Armour:
  Effect: Body Def +30
  Cost: 8,600 Ducat
  
• Carbon-Coat Steel:
  Effect: Body Def +20
  Cost: 11,800 Ducat
  
• Ragnite Alloy:
  Effect: Body Def +20
  Cost: 19,100 Ducat
  
• Hardened Ragnite:
  Effect: Body Def +25
  Cost: 27,200 DUcat
  
• Gun Barrel Armour (final upgrade)
  Effect: Body Def +30
  Cost: 31,600 Ducat

Tread HP (red)

Edelweiss' tread HP is 650, plus any bonuses from body upgrades, plus the effect of these parts.

• Spare Belt:
  Effect: Tread HP +50
  Block size: 1 x 1
  Cost: 1,000 Ducat
  
• Spare Idler:
  Effect: Tread HP +75
  Block size: 1 x 2
  Cost: 2,900 Ducat
  
• Spare Tread Set:
  Effect: Tread HP +125
  Block size: 1 x 3
  Cost: 9,200 Ducat
  
• Spare Drive Parts:
  Effect: Tread HP +225
  Block size: 2 x 3
  Cost: 12,000 Ducat
  
• Enhanced Block Pin:
  Effect: Tread HP +400
  Block size: 3 x 3
  Cost: 0 Acquired by defeating Medium Tank Ace Yosnoa the Hound in Chapter 12: The Fight for Bruhl

Tread Defence (yellow)

Edelweiss' tread defence is 100, plus any bonuses from body upgrades, plus the effect of these parts.

• Leaf Spring:
  Effect: Tread Def +10
  Block size: 1 x 1
  Cost: 1,000 Ducat
  
• Coil Spring:
  Effect: Tread Def +15
  Block size: 2 x 1
  Cost: 2,500 Ducat
  
• Reinforced Leaf:
  Effect: Tread Def +25
  Block size: 3 x 1
  Cost: 4,300 Ducat
  
• Reinforced Coil:
  Effect: Tread Def+35
  Block size: 4 x 1
  Cost: 6,000 Ducat
  
• Carbon-Coat Leaf:
  Effect: Tread Def+45
  Block size: 2 x 2
  Cost: 8,000 Ducat
  
• Double Coil:
  Effect: Tread Def+70
  Block size: 3 x 2
  Cost: 10,000 Ducat
  
• Torsion Bar
  Effect: Tread Def+100
  Block size: 3 x 2
  Cost: 12,000 Ducat
  
• Reinforced Torsion Bar:
  Effect: Tread Def+150
  Block size: 4 x 2
  Cost: 15,000 Ducat

Critical Defense (green)

The Edelweiss' critical hit rating is 10 minus the effect of these parts divided by one hundred. The resulting number is the multipler applied to damage to the tank's radiator; the minimum is 1.

• Hardened Plate:
  Effect: Critical Def +50
  Block size: 1 x 1
  Cost: 1,000 Ducat
  
• Steel Alloy Plate:
  Effect: Critical Def +70
  Block size: 2 x 1
  Cost: 2,900 Ducat
  
• Hard Steel Plate:
  Effect: Critical Def +130
  Block size: 3 x 1
  Cost: 5,200 Ducat
  
• Carbon-Coat Plate:
  Effect: Critical Def +200
  Block size: 2 x 2
  Cost: 8,000 Ducat
  
• Ragnite-Coat Plate:
  Effect: Critical Def +300
  Block size: 3 x 2
  Cost: 11,200 Ducat
  
• Ragnite Plate:
  Effect: Critical Def +450
  Block size: 3 x 3
  Cost: 14,700 Ducat

Sight Parts (blue)

The Edelweiss' Innate Accuracy is 6 plus the total effect of these parts.

• Bulletproof Visor:
  Effect: Accuracy +5
  Block size: 1 x 1
  Cost: 1,000 Ducat
  
• Periscope:
  Effect: Accuracy +7
  Block size: 2 x 1
  Cost: 2,900 Ducat
  
• Monocle Sight:
  Effect: Accuracy +12
  Block size: 2 x 2
  Cost: 5,200 Ducat
  
• Rotating Periscope:
  Effect: Accuracy +16
  Block size: 3 x 2
  Cost: 8,000 Ducat
  
• Stereoscopic Sight:
  Effect: Accuracy +25
  Block size: 4 x 2
  Cost: 11,200 Ducat
  
• Firing Calculator:
  Effect: Accuracy +20
  Block size: 4 x 1
  Cost: 0 - Acquired by defeating enemy Tank Destroyer Ace Matz the Cleaner in Chapter 15: Citadel Ghirlandio (Pt.1)

Firing Calculator renders Stereoscopic Sight redundant, since Firing Calculator + Periscope + Bulletproof Visor fit into the same space with one block spare, while providing +32% accuracy instead of +25%. It's readily possible for the Edelweiss to fit Bulletproof Visor + Periscope + Monocle Sight + Rotating Periscope + Firing Calculator into the 5 x 4 grid, for a +60% accuracy bonus with three blocks remaining; Extra Magazine and one of the 1x1 parts will fit into these gaps.

Magazine (purple)

The Edelweiss' mortar round ammunition is 1 plus the effect of these parts. Ammunition parts do not effect the number of smoke rounds available.

• Extra Magazine:
  Effect: Ammo + 1
  Block size: 1 x 2
  Cost: 1,000 Ducat
  
• Rear Magazine:
  Effect: Ammo + 1
  Block size: 1 x 3
  Cost: 2,000 Ducat
  
• Turret Magazine:
  Effect: Ammo + 2
  Block size: 2 x 3
  Cost: 4,000 Ducat

Body Upgrades

The Shamrock's body upgrades only increase body HP, with no other bonus.

• Rivet Construction:
  Effect: Body HP +100
  Cost: 10,000 Ducat
  
• Point Soldering:
  Effect: Body HP +100
  Cost: 26,400 Ducat
  
• Plane Soldering:
  Effect: Body HP +100
  Cost: 36,000 Ducat

Armour Upgrades

Upgrades to the body's defence rating.

• Rolled Steel:
  Effect: Body Def +20
  Cost: 7,500 Ducat
  
• Carbon-Coat Steel:
  Effect: Body Def +20
  Cost: 18,500 Ducat
  
• Ragnite Alloy:
  Effect: Body Def +30
  Cost: 31,300 Ducat

Anti-Armour Turret Upgrades

Upgrades in this category improve the mortar and gun of the Shamrock's anti-armour turret, and also include improvements to the machine gun common to all three turrets. They typically also change the name of the weapon they upgrade on the outfit screen.

• Anti-Armour Rounds:
  Effect: Main gun +40 vs Person, +150 vs Armour
  Cost: 12,000 Ducat
  
• Increased Payload:
  Effect: Mortar +110 vs Person, +50 vs Armour +10 Blast
  Cost: 17,000 Ducat
  
• Enhanced Gun:
  Effect: Machine gun +13 vs Person, +6 vs Armour
  Cost: 20,800 Ducat
  
• Piercing Rounds:
  Effect: Main gun +40 vs Person, +250 vs Armour
  Cost: 24,000 Ducat
  
• Improved Shrapnel:
  Effect: Mortar +80 vs Person, +50 vs Armour +10 Blast
  Cost: 26,900 Ducat

Machine Gun Turret Upgrades

Upgrades to the "Gatling gun" (machine gun) turret.

• Link Belt:
  Effect: +5 vs Person, +2 vs Armour
  Cost: 8,300 Ducat
  
• Auto-Reload Device:
  Effect: +10 vs Person, +2 vs Armour
  Cost: 19,100 Ducat

Flamethrower Turret Upgrades

Upgrades to the flamethrower turret.

• Flame Intensifier:
  Effect: +150 vs Person, +5 vsArmour
  Cost: 9,000 Ducat
  
• High-Temp Fuel:
  Effect: +110 vs Person, +5 vsArmour
  Cost: 18,100 Ducat

Tread HP (red)

The Shamrock's tread HP is 650, plus the effect of these parts. The Shamrock never recieves any bonuses to tread HP from body upgrades.

• Spare Belt:
  Effect: Tread HP +150
  Block size: 1 x 3
  Cost: 3,500 Ducat
  
• Spare Idler:
  Effect: Tread HP +300
  Block size: 1 x 4
  Cost: 7,000 Ducat

Tread Defence (yellow)

The Shamrock's tread defence is 100, plus the effect of these parts. As with tread HP, body upgrades do not increase the Shamrock's tread defence.

• Leaf Spring:
  Effect: Tread Def +25
  Block size: 2 x 1
  Cost: 3,500 Ducat
  
• Reinforced Leaf:
  Effect: Tread Def +65
  Block size: 3 x 1
  Cost: 10,000 Ducat
  
• Carbon-Coat Leaf:
  Effect: Tread Def +100
  Block size: 3 x 2
  Cost: 20,000 Ducat

Critical Defence (green)
The Shamrock's critical hit rating is 10 minus the effect of these parts divided by one hundred. The resulting number is the multiplier applied to damage to the tank's radiator; the minimum possible for the Shamrock is 1.5.

• Steel Alloy Plate:
  Effect: Critical Def +300
  Block size: 2 x 2
  Cost: 6,000 Ducat
  
• Carbon-Coat Plate:
  Effect: Critical Def +550
  Block size: 2 x 2
  Cost: 20,000 Ducat

Sight Parts (blue)

The Shamrock's innate Accuracy is 10 plus the total effect of these parts.

• Periscope:
  Effect: Accuracy + 5
  Block size: 1 x 1
  Cost: 6,000 Ducat
  
• Monocle Sight:
  Effect: Accuracy + 10
  Block size: 2 x 1
  Cost: 18,000 Ducat
  
• Firing Calculator:
  Effect: Accuracy + 15
  Block size: 3 x 1
  Cost: 0 - Acquired by defeating enemy Heavy Tank Ace Toyold the Bull in Flower of the Battlefield

Magazine (purple)
The Shamrock's mortar round ammunition is 1 plus the effect of these parts.

• Extra Magazine
  Effect: Ammo + 1
  Block size: 1 x 3
  Cost: 3,000
  
• Underside Magazine
  Effect: Ammo + 1
  Block size: 1 x 2
  Cost: 6,000

Most information in the guide is from http://valkyria.wikia.com/wiki/Valkyria_Wiki after data-checking ingame.

Good Luck on Retrofitting the Edelweiss or Shamrock into the tank you need to defeat the Empire!