Interesting question. I completed my service obligation in December of 1983 and have only an opinion on what the current attitude is. My guess is that while the majority are probably still believers, ranks of non-believers is growing rapidly, just as it is in the rest of society.

For my part, I can say that when I enlisted in 1979, I was a dyed in the wool believer, sickeningly "witnessing" to anyone who would listen in idiotic attempts to save their "immortal souls." In basic training (Air Force), I recall everyone went to church, mostly to escape the alternative of cleaning toilets or whatever in the barracks. I went too, and I was immensely disappointed at the concert atmosphere. I barely remember what the chapel was like, but there was a stage with a live band. There was no real message or lesson being delivered. It was just entertainment. This was the beginning of the end for me. I wouldn't say I became an Atheist as a result of the experience, but my opinion certainly changed at that time. New information later helped to change my thinking completely.