Were there any instances in which his experience as a paratrooper affected his writing?

His war experiences on Leyte (where he fought as a paratrooper) informed his writing throughout his career. But we are unaware of any paratrooper characters in his work.

The pre-Twilight Zone stuff is particularly war-heavy. I would point to the 2009-reissued The Strike (1954) as emblematic of Rod’s response to war.