I understand that in ArmA 2 there were numerous scripts that allowed for vehicles to be dropped via parachutes and the same goes for ammo crates, but if this was a default function in the game. This would make map making for those who are not good at scripting the ability to still have a dynamic mission.
http://media.defenseindustrydaily.com/images/AIR_CH-47_Dutch_w_Underslung_lg.jpg
http://www.jakartagreater.com/wp-content/uploads/2012/07/AIR_CH-47_Dutch_Carrying_F-16_lg1.jpg
http://www.chinook-helicopter.com/news/General_News/grounded_xmsns/CH47_tank.jpg
http://usarmy.vo.llnwd.net/e2/c/images/2011/09/16/220175/size0.jpg
http://4gwar.files.wordpress.com/2011/09/frifo-paratroopers.jpg