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Military camouflage is the use of camouflage by an armed force to protect personnel and equipment from observation by enemy forces. In practice, this means applying colour and materials to military equipment of all kinds, including vehicles, ships, aircraft, gun positions and battledress, either to conceal it from observation (), or to make it appear as something else ().
This category is for images (including graphics and photographs) taken or made by members of the U.S. military or Department of Defense during the course of the person's official duties. Under United States copyright law, such images are public domain . The preferred destination for such uploads is Commons Category:PD US Military.
Navy: identical to the Army flag, but with the lower 40% has three blue and two white horizontal stripes of equal width. Air Force: identical to the Army flag, but with the lower 40% coloured air force blue. Rocket Forces: identical to the Army flag, but with the lower 40% being a gold stripe.
The awards and decorations of the United States Armed Forces include various medals, service ribbons, ribbon devices, and specific badges which recognize military service and personal accomplishments of members of the U.S. Armed Forces. Such awards are a means to outwardly display the highlights of a service member's career.
Louis Essen (right) and Jack Parry (left) standing next to the world's first caesium-133 atomic clock in 1955, at the National Physical Laboratory in west London.. The Scottish physicist James Clerk Maxwell proposed measuring time with the vibrations of light waves in his 1873 Treatise on Electricity and Magnetism: 'A more universal unit of time might be found by taking the periodic time of ...
The XII position is true north. A clock position, or clock bearing, is the direction of an object observed from a vehicle, typically a vessel or an aircraft, relative to the orientation of the vehicle to the observer. The vehicle must be considered to have a front, a back, a left side and a right side.
The military time zones are a standardized, uniform set of time zones for expressing time across different regions of the world, named after the NATO phonetic alphabet. The Zulu time zone (Z) is equivalent to Coordinated Universal Time (UTC) and is often referred to as the military time zone. The military time zone system ensures clear ...
The Shortt–Synchronome clock, an electrical driven pendulum clock designed in 1921, was the first clock to be a more accurate timekeeper than the Earth itself. [167] A succession of innovations and discoveries led to the invention of the modern quartz timer. The vacuum tube oscillator was invented in 1912. [168]