ROYAL AIR FORCE BASE MILDENHALL, England -- Defensor Fortis, or defenders of the force, is the motto all U.S. Air Force Security Forces airmen live by. The 100th Security Forces Squadron armors at Royal Air Force Mildenhall, England, defend the force in numerous ways. Armors not only issue patrolmen weapons during shift changes and maintain armory inventory, but also perform maintenance by dismantling and greasing weapons.