I retired in '91 and during my career I only saw one AF warrant officer. In 1971 I was going to tech school at Chanute to be a firefighter. The Chief of the school was a very old W-4.
Sorry to confuse you ops33, but my "W04Man" handle doesn't stand for W-4. It stands for Bush 2004, ie http://W-04.com. You are right, I retired in '83 and there were not very many warrant officers in the AF. I knew a couple in the late 50s/early 60s.