Streamers
Cokes and Rooney sing a song about streamers (soldiers from the Airborne whose parachutes don't open) to the men in the barracks while they are drunk. The song creates the terrifying imagery of death as they could imagine losing their 'chutes and free falling to the earth like a knife (as described earlier).
Fear
Carlyle comes into the barracks drunk after the lights have been turned out by Cokes and Rooney in Act I. He is terrified of being chosen to go to Vietnam because he believes he is going to die. He tells Roger that he knows he is going to die, he has no one there in the Army to stand with him, no one that is like family. There is nothing like home that ties him to staying behind thus they are going to send him to the war. His fear and paranoia exemplify the theme of waiting for the war becoming embodied and we experience the horrifying psychology a solder might experience prior to ever setting foot on a battleground.
Storyteller
Billy tells the story of his friend, Frankie who he knew in high school and how they would let gay men pick them up at bars in order that they would pay for their drinks before the kids ditched them. Frankie then goes on to become a gay man. Once the story is over Richie says that Billy is a storyteller. The imagery that Billy's monologue creates, combined with Richie's statement allows the audience to suspect that Frankie could either be real or a fake name Billy uses to cover for his own actions.
He didn't sing it
Cokes begins to mimic what one of the men he was in a platoon with did before he plummeted to his death, he reaches upwards as if desperately attempting to claw at the sky as his legs pump up and down. The imagery creates the haunting image of watching a comrade falling to his inevitable death, and there being nothing to do to help.
