Old Army basic trainees do too. In 1962 they walked us down a hall in the Fort Jackson Dispensary with multiple doors on each side. We stopped at every door and were greeted by another medic holding one of these pneumatic vaccine blasters in his hand. If they didn't have the things firmly pressed against your muscle when they pulled the trigger, it would almost break your arm. Then, that October, came the Cuban Missile Crisis, when they marched us back down to the Dispensary for Yellow Fever shots; you know, just in case we should find ourselves in a tropical setting.