lz helicopter landing zone m-14 semi-automatic 7.63 assault rifle , usually used as a sniper rifle m-16 5.56 mm assault rifle m-1a1 , m-1a2 abrams tank m2 , aka ma deuce 12.7 mm machine gun , mounted in a turret m-203 40mm grenade launcher mounted under an m-4 or m-16 m24 7.62 mm sniper rifle m240b 7.62mm machine gun , either carried or mounted in a turret m249 5.56 mm machine gun , usually carried m2a1 bradley infantry fighting vehicle m-4 5.56 mm assault rifle , a shorter version of the m-16 m-9 9mm pistol carried by many soldiers medevac medical evacuation ( usually by helicopter ) meps military entrance processing station where you join the military mgs mobile guns system , a 105mm cannon mounted on a stryker mi military intelligence mk-19 , mark -19 vehicle mounted automatic 40mm grenade launcher mos military occupation specialty mp military police mrap mine resistant armored patrol vehicle ncoic sergeant in charge nvg night vision goggles oic officer in charge op observation post .