THAT is hilarious. Just think of what would be said if a higher grade officer walked by while that new LT was tapping on the armor of the Bradley.
Well, I was the Battalion Commanders gunner on a Brad fr a while, and he did not know that there indeed was a can of dry air for purging the thermal integrated sight unit- PFC Achayan ad I had fun with the LTC for a bit- he had a good sense of humor- later, years later after we both had retired from the Army, I had the pleasure of working with him on a research project- he was a Northrup Grumman guy and I was a university research scientist. He had made full Colonel ( a West Pointer) and I had made Major (from PVT).