Full link below which makes interesting reading.
Just copied this bit on how records were selected for broadcast in Vietnam.
https://topicsinamericanhist.tripod.com/id19.html
How music was selected for AFVN. If music was not selected for AFVN on the basis of genre, then how was it selected? An AFVN disc jockey named Adrian Cronauer (who happens to be the man that the main character of Good Morning Vietnam was based on) recounts the procedure that companies had to go through, and still go through on Armed Forces Radio today, to get their songs played on AFVN.
If a company wants their record played on AFRS22, they sign the appropriate paperwork and give a master tape to AFRS in Los Angeles where it is recut on the AFRS label... These are the only records allowed on the premises and, therefore, the only ones you could use on the air."