A young women going into the Air Force in a support role is highly unlikely to ever be near the front lines; that is the bailiwick of the Army and Marines. She wants to go into a PR role, so the chances of this are slim.

I grew up a military brat, did almost 10 years myself in the Corps. I was in during DS1 and almost no one I know from that "war" has PTSD. I personally know several Marines who sent dozens of people to their graves and they are are normal as anyone else. PTSD depends on the mental strength of the individual. My own grandfather (WWII in Asia) did a 20+ year career, and my dad (grunt in Vietnam) who also did a 20+ year career didn't suffer from PTSD. My dad was a machine gunner in Vietnam. He was involved in horrible circumstances. His unit was once embattled around a US airfield in a protection role against sappers, and every man on patrol was wounded as well as covered in leeches from fighting in the nasty water. He went on dozens of missions and did and saw all manner of stuff. My dad was well adjusted, went on to earn a master's degree in engineering, and was an all around swell guy.