I was station on NAS Jax a Navy air station and I was attending my course required by all military personnel who ride motorcycles and just happened to look up at the sky due to a incident I had years before that caused me to become a sky watcher now, and noticed a silver sphere looked similar to a be be or ball bearing maybe even a oval or cylinder like. I didn't want to seem weird so I didn't make a big deal just watched it close. at a point we had to all get on the start of the obstacle course on our motorcycles to start the program and when I got to the location where we began, I looked up and the object was gone. All this was within a 5 min time frame. I looked up several times at the object which was really high up, but the lack of movement really made me curious about it.