How to: Make Airstrike available in skirmish/multiplayer

In this tutorial we will make the Russian Su-25 Airstrike available as soon as you start a game:

Steps
1. Go to set/multiplayer/units/vehicle_rus.set
2. Find the line: {"airstrike_bomb_rus" ("va" cd(900) ci(300) v(su-25k_rus)t(conquest hero) s(rus) n1(1) g(cv3) sc(0.05) b(hero) cw(0) cp(2.5)) {cost 5.0} {action "airstrike:airstrike_bomb"} }
3. Change b(hero) to B(v3).
4. Change t(conquest hero) to t(all infantry combined_arms conquest)
5. Change cd from (900) to (0). This will mean the airstrike does not have an initial cooldown period before it becomes available.

Background knowledge:
Within the vehicle_rus.set file:
1. cd is used to denote how long it takes for a unit to become available for call in after the game begins.
2. ci is similar to cd but it is the time it takes for a unit to become available for call in after you have called it in once already.
3. The b() is used to denote which button a unit will appear under:
b(s1) = Unit is called in under the first button (where most of your frontline infantry appear)
b(s2) = Unit is called in under the second button (where most of your support infantry appear)
b(v1) = Unit is called in under the third button (where most of your support vehicle/light vehicles appear)
b(v2) = Unit is called in under the fourth button (where most of your medium vehicles appear)
b(v3) = Unit is called in under the first button (where most of your heavy vehicles appear)
b(hero) = Unknown