Air Force, and United States Space Force give salutes with heads both covered and uncovered, but saluting indoors is forbidden except when formally reporting to a superior officer or during an indoor ceremony. When outdoors, a head cover is to be worn at all times when wearing Army Combat Uniforms, but is not required when wearing physical training (PT) gear. The United States Navy, Marine Corps and Coast Guard do not salute when the head is uncovered or out of uniform. US state defense forces State defense forces (SDF) in the United States are military units that operate under the sole authority of a state government. State defense forces are authorized by state and federal law and are under the command of the governor of each state. State defense forces soldiers are subject to the Uniform Code of Military Justice. They are also subject to their state military laws and regulations and render the same customs and courtesies as active duty, Reserve and National Guard personnel. Zogist salute The Zogist salute is a military salute that was instituted by Zog I of Albania. It is a gesture whereby the right hand is placed over the heart, with the palm facing downwards. It was first widely used by Zog's personal police force and was later adopted by the Royal Albanian Army. In Mexico, a salute similar to the Zogist one is rendered by Mexican civilians during the playing of the Mexican national anthem. Non-military services Canada Police services The majority of police forces are taught to salute like the Canadian Armed Forces with a level palm and the middle finger aligned with the right eye, and not the brim of the hat. The federal Royal Canadian Mounted Police salute according to the British Army tradition with the palm facing forward. Non-police Similar salutes are used by guards of honour for non-police services (e.g. Toronto Fire Services, Toronto Transit Commission) during funerals or ceremonial events. Hong Kong All uniform branches of the Hong Kong Police, Police Auxiliary, Police Pipeband, Fire (including Ambulance service members), Immigration, Customs, Correctional Services, Government Flying Service, Civil Aid Service) salute according to British Army traditions until 2021. Personnel stationed with the People's Liberation Army in Hong Kong salute using the Chinese military standards and similar to those used by the Royal Navy. Non-government organizations like Hong Kong Air Cadet Corps, Hong Kong Adventure Corps, the Boys' Brigade,