Had my bike ('89-'91ish Schwinn Probe) shipped to my first base. I had always lived in rural areas, so I never really thought about locking up my bike- there was no need. With my 19-year-old-straight-outta-basic logic, I figured I wouldn't need to lock my ride up since I was on an Air Force Base (everybody there has high integrity, right?)- WRONG! It was stolen off the bike rack the first week I was there. There were actually a lot of other bikes on that rack that weren't locked up either.
Honorably discharged almost 10 years ago- I remember it was mandatory to wear a helmet if you were riding a bike on base.