How will prior marijuana use affect potential employment?

I have never actually been arrested for possession or for smoking marijuana, but I have been in trouble for it. When I was 17 I was living on a military base overseas and received probation when an NCIS investigation uncovered that I had smoked with some other kids 3 months prior to being questioned. All I received was probation. Then when I was 23, and in college, I was in an on-campus apartment, and was caught by the university police with a "usable amount" of marijuana and paraphernalia, I was suspended from the unveristy but was reinstated within a week under the condition that I make use of the unversity counseling services. Will these incidents prevent me from getting from getting hired for "real" post college jobs or from becoming an officer in the Air Force?