If you didn't know, heres the secret. First you have to unlock the "Well Rounded Soilder" award and it will say "weapon room unlocked". You quit and then go to the training mission by tapping on training. The guy won't say "To the right is the weapon instructor" and all that he'll just say "over to your left is the course instructor" because if you go to where the weapon instructor was, you will see the door to him is closed an a door will be opened to the weapon room and you get to use those weapons for the course! Hope I helped. P.S if you don't understand, just ask below
go to the place where the shooting target place is and the door will be closed and the door beside it will be open
My 13yr brother will answer this question. How to unlock: How to get there: Does my brother help, I seen this room, full of guns, it's a fun place (I couldn't understand the above advice, but my brother had a different understanding, since I understand his method I thought it might help others) Also this should be in the cheats and hints section, but it'll do fine for now.