Which of the following can you infer from you reading of the poem? (in The Death of the Ball Turret Gunner)

Gunners had a low casualty rate.

Gunners were protected by the turret.

Few airmen volunteered for positions as gunners.

Gunners were among the most experienced airmen.

The anwer is Few airmen volunteered for positions as gunners.

in The Death of the Ball Turret Gunner depicted the situation in World War II. You can see it from these lines:

Six miles from earth, loosed from its dream of life, - indicates that he's lonely

I woke to black flak and the nightmare fighters. - indicates that he held the position as gunners.