Are You The First To Fight?? Punk?!

"Code Red! Code Red! We've 12 marines stuck between drop zones gamma and lambda! Requesting immediate back-up over!"

The deafening sirens woke you up from your slumber. Though still lacking of sleep, you have a duty; a commitment to fulfill to your country. You quickly arm yourself with your trusty M16A2 Colt 5.56mm AR; the best the business has to offer. "Lock and Load!" you shouted, readying your teammates for combat. Rifle in hand, and grenades at its place, all is set. The sound of the chopper's blade cutting the hair; peace. The sound of marines screaming order; war. The sound of an M16 letting go a full round; symphony.
When everyone else can't be contacted in time, you are the...