I'll never forget my first salute. A newly commissioned APO, I was still 2 days short of my 18th birthday and I was walking down to the squadron on my first morning. I was saluted by a crusty old Regiment sergeant who was more than twice my age, and I very proudly returned the salute. When I got down to the squadron I told our 2 i/c that I had just had my first salute. He reminded me that when we salute we are saluting the appointment (and indirectly the monarch), not the individual. So I would have no difficulty in saluting a PM or minister of whatever political stripe - it would not imply any approval, or otherwise, of their policies.