by air Boeing C-17 fly over the zone then spawn in AI HALO Jump http://www.armaholic.com/page.php?id=23113 then attach red flare or red smoke depend on time of day or night. but remember this when you going to drop a larger amount spawn some kind air cover first so the transport don't get shoot at or down. but as the transport deploy troopers then defense follow C130 Variants or large plane away. here fun I did on friend on April fool day I download District9 Mech or http://www.armaholic.com/page.php?id=12859 and made it look like a statue. then use in middle of the fight.