The US military also has its rules regarding hats. The Army and Air Force require you to salute an officer or superior officer indoors weather you are wearing a hat or not. The Navy on the other hand requires you not to salute indoors or while not wearing a hat. The Navy also required you to remove your hat when entering a sickbay or medical facility.
Feet need to breath and shed sweat. Sandals are perfect for that. Sandals let you display your painted and decorated toenails and also your toe rings. Boots just hide that and make your feet sweat.
Man, it would be nice to sneak off to Sydney or Melborn where it is summer and sandal weather. This northern hemisphere winter weather is too cold and tiresome for too long.