When I was in SAC our motto was "Peace is our profession." We followed that up with the addendum "Mass murder is just a hobby."
My favorite T-shirt had drawing of an ICBM on it. Wrapped around the missile was a bright red ribbon with a gift tag attached to it that said "To Russia w/Love" The caption on the shirt read "Minuteman III ICBM - When you care enough to send the very best"
My favorite saying, "B-52 Stratofortress - America's proof to the world that with a big enough engine even a brick will fly!"