From a developer perspective it's always funny to watch how player's actually go about completing the missions. When creating a mission you typically have a few tactics in mind you imagine the player could use but that's not always the case. After watching your walkthrough I've only been confirmed in that matter. For the most part you do (almost) as I would expect but from time to time you break the pattern or use a loophole I didn't see coming. Not that there is a poblem with that. Actually it brings a little smile to my face when players surprise me :)

How many times have you completed the campaign? I can't quite figure it out since in some missions you are razor sharp on what to do but in others you shift strategy on the fly. Anyway, a few impressions:

Ar03 - Yeah I knew this mission was on the easy side but I didn't know it was that bad. The second American attack never even showed up. I gotta do something.
Ar04 - Building an amoury just outside the American base is just cheating :P
Ar06 - Wow... I never realized how powerful flame throwers would be in this mission to handle the fleeing Russian.
Ar08 - Camping the Russian spawn point. No fair! :P But I was wondering what you actually gained from doing it after the Yashin and Martin events.
Ar10 - Awhat?! Ok... did not know you could crawl past the Russian defences. Well spotted.
Ar11 - Mortars + radar be OP. Arabs are scary when they get that and stim drugs.
Ar12 (pro arab) - This is the most hacky shi... I've seen for long. Using engineers offensively by dismantling buildings (why is that even possible OW?!); dragging out taking over the base so you can research a ton before the timer starts. Using breastworks as cushions against imposion vehicles. I have no words for this. But the mission has been made easier if that was the problem.
Ar15 (legion) - Did you actually plan on capturing the American siberite bomb or was it pure luck? That moment was amazing :P

It was funny reading that too.
As for missions they where played in different order. Some where played like 10-15 times to find the easiest solution. Some (like second pro arab) where just finding any strategy that would carry at least for 15 min from 1h. Some are played with the small mod i made where shortcuts are in grid setup (on the forum i made topic about that). Solution was made with the mind to find easy and replaceable tactics. Some missions in my main campaign i play completely different.
Why every mission start me without any research? Why do i need constantly to research disel engine.
Ar 04 - USA defense is much better than russian, with vehicles you can only attack reasonably from the south. No point destroying them first since russians have better vehicles that are tougher and deal more damage. The russian armory is brutal to destroy.
5th mission was full improvisation since it's really easy. Grab resources, build few flamers and guns. You need only 4 vehicles to survive the attack. As for flamers, i would use them constantly, but later russians have bazookas with time ammunition that prevent closing fast enough on them. It's great weapon but it's introduced too late in campaign to make any difference. Only 6th mission benefit from it.
Ar8, once i found this camping spot i just stick to it. Without that i would need to micro infantry attacking south of my base and could kill transporter, monkey or other personnel. If you see that video, before the attack i was mustering strength to attack them and i would succeed :)
Ar10 - would be nice to remove the most south tree blocking full ninja approach. Basic plan i was trying few times was just bomb rushing behind factory with everyone but it could easy end with full wipe. I was looking for easy way to get to gossudarow. Once he is escaping some times you destroy transport, repair it and get mission lost, not worth the risk. Destroying defense was never an option in my mind. Some people want to sell this group so the rest of the map have mines. Mines prevent easy access to resources and can be cough by enemy attack. It's muddy map so this is instant death for driver. You can bomb rush this HG turret with remote mines and work from there but factory will constantly build vehicles. This group that can help you have randomized vehicles so it's lottery too. Once i get only light MG...
Ar11 russian base is too well defended to even consider other options.
Ar12 attacks where tough to defend from and you still have prisoners that you can instantly kill. To catch bomb you need to kill all 3 remote controllers AND defend yourself. I don't see any other option like cheat with that. Bazookas, HG, mortars and bombs? That's heavy stuff to throw at player that don't even have time to build defense on this really flat place. I don't have access to computer defense. Interesting enough you can capture the leftovers from american defense and build base above. For my option that was too much break of the mission. I know first wave should be quick (i read the notes ;) ) but it's too quick i always lost someone in that attack.
Ar15 legion if i could i would capture it always but the next one was queue as backup. Sadly any other option is too much luck dependent and is overall slower with spreading yourself too thin. You can capture russian base under 5 min rusing with mines and mortars to clear slowers.Then just put all soldiers to defend against arabs and spam only alaskit bombs, but that's not fun. The biggest threat are arabs, because nobody care about them. This two gatlings can only stop one scientist. Too bad there is no back entrance to american base. They have snipers preventing total annihilation but still, they have the best defended base. Arabs are only annoying with their mines.
The same could be said about 15 pro arab. Main american base is too well defended to even consider going through them. The outpost is pain in the ass too. River and narrow entrance vs spam of rockets. I have some interesting tactic but i need to muster my strength to try again. Its really long and most of the time boring mission to do again, unlike legion who i played few times just for fun. Artefacts are useless in my opinion, only turning off slowers are helping. Bombs are nice but enemy turn back too fast to destroy anything. I would much prefer option to get tau field like russians for limited time that freeze dying.
Still mission 8 is too long for like 10 min. After 30 min mark it's becoming really boring.
Mission 9 would be nice to have information that captured vehicles will transfer to the next mission.
10 mission is again too long. Before second and third wave you don't have much to do 5 min less would be nice, even now when the attacks are weaker.
12 pro arab is just long mess. I can attack and destroy american base even with starting troops in like 5-8 min but i need to sit 30 min defend base in this awkward position, keep this prisoners and capture bomb. The process is not mention. You need to kill every controller and damage it. Why not just damage and repair yourself? Killing controllers would remove legion vehicles attacking your base. This would give you medal and actual bonus in that mission.
13 pro arab map is just boring and offer little to none options. Left and top have nothing interesting. Dense forest would allow to funnel enemy in to mines etc.
14 pro arab - for evacuated base it have really strong crew. Everyone in that time is on the main alastik source. Bazokers in a bunkers are just pointless, why not computer rockets? It also have so small exit area that you need to make tetris to fit half of your stuff.
15 pro arab would be nice if not for this suicidal waves of vehicles from all sides that want you dead. If you are even 30 sec late with the attack, you get monstrous american or russian wave attacking you.
13 legion have ♥♥♥♥ move with so many snipers in the barracks
14 legion have ♥♥♥♥ move with so many bazookas in the barracks.
Both just removing two specialist would speed up the mission in like 20 min

One of the way to improve this mission is get two soldier patrols. That way this vehicle could be actual useful. Instead of one wave, make it smaller but more frequently. Overall you can train monkeys and put everyone else on transport duty and finish the mission even before first attack. It's really close but possible. Get some random soldiers attack from the main depot side. Make monkeys an actual reward, with timer and constant small attacks they would really help.

Thanks for the detailed feedback. I'll work through it as I get the time.

Well i found easier way for this mission with latest update
https://youtu.be/GcDQeen0idk