After Solo and the girl leave the silo, where they had been hiding buried in the grain, her black sweater was completely clean, although Solo's shirt was somewhat dusty. In a later scene, the girl's sweater was dusty, too.
The Major refers to the dead airman as Airman First Class. The previous scene clear shows him with three strips of a Sergent, not the two stripes of an A1C. Sergeant was not an E-4 rank in the USAF until 1967. 3 years after this aired.