Press this once and it shows you the anti-aircraft capability of your units. Press it again and it shows you the anti-aircraft capability of your enemy's units. Press one more time and all this is turned off.
Why should I care? If you are looking to see how well you are protecting your most important assets from air attack--then this is your button. Want to see how your enemy is trying to do the same? This is your button.
Why is this important? Well...if you want your air units to survive and thrive, then don't send them into The AA Red Zone more than you have to. BUT...if you absolutely need to bring it home For The Win, then put in the planes--all of them--and suffer the heat--hope for the best.
So. Anti-aircraft...think about it. It matters to your planes and the accomplishment of your mission. Press Hotkey-A and ponder the impact of anti-aircraft (yours and theirs) on your course of action.
