SOS is the international Morse code distress signal (· · · – – – · · ·). This distress signal was first adopted by the German government in radio regulations effective April 1, 1905, and became the worldwide standard under the second International Radiotelegraphic Convention, which was signed on November 3, 1906, and became effective on July 1, 1908. SOS remained the maritime radio distress signal until 1999, when it was replaced by the Global Maritime Distress and Safety System. SOS is still recognized as a visual distress signal.
The SOS distress signal is a continuous sequence of three dits, three dahs, and three dits, all run together without letter spacing. In International Morse Code, three dits form the letter S, and three dahs make the letter O, so "SOS" became an easy way to remember the order of the dits and dahs. In modern terminology, SOS is a Morse "procedural signal" or "prosign", and the formal way to write it is with a bar above the letters: SOS.
In popular usage, SOS became associated with such phrases as "Save Our Ship" or "Save Our Souls" or "Send Out Succour". SOS is only one of several ways that the combination could have been written; VTB, for example, would produce exactly the same sound, but SOS was chosen to describe this combination. SOS is the only nine-element signal in Morse code, making it more easily recognizable, as no other symbol uses more than eight elements.
The 21st Special Operations Squadron is a unit within the 352d Special Operations Group (352 SOG), United States Air Force, United States European Command, and was based at Royal Air Force base RAF Mildenhall in Suffolk, eastern England.
The 21st Special Operations Squadron, which fell under the 352nd Special Operations Group, RAF Mildenhall, UK, was inactivated on 31 October 2007 with the inactivation ceremony taking place at RAF Mildenhall, UK on 9 October temporarily ending the Air Force Special Operations vertical lift mission in Europe.
The inactivation of the Dust Devils was the first step in preparation for the arrival of the CV-22 tilt-rotor aircraft.
The 21st Special Operations Squadron's mission consisted of day or night, all-weather, low-level penetration of denied territory to provide infiltration, exfiltration, resupply, or fire support for elite air, ground, and naval forces. The unique capabilities of the MH-53J permitted the squadron to operate from unprepared landing zones.
The 3d Special Operations Squadron (3 SOS) flies MQ-1 Predator Remotely Piloted Aircraft (RPA) and is currently located at Cannon Air Force Base in Clovis, New Mexico. The 3d SOS is under the command of the Air Force Special Operations Command.
Currently operates Predators engaged in Enduring Freedom.
Organized in France in April 1918, the Photographic Section No. 1 processed aerial photographs taken by flying units working with the I Army Corps (American) and French XXXVIII Army Corps, 5 April–November 1918. The 1 Photographic Section, from September 1919 until becoming the 3 Observation Squadron on 1 June 1937, processed aerial photography of associated observation squadrons in Texas.
At Langley Field, VA, the squadron engaged in aerial observation work with the Coast Artillery School until April 1942. It supported ground forces on maneuvers during 1942, and served as a training and demonstration unit January 1943 – February 1944. The squadron was not manned or equipped, 1 Mar – 2 July 1944.
HUMO is a popular Dutch-language Belgian weekly radio and television supermarket tabloid.
Humoradio (meaning a portmanteau of 'humor' and 'radio' in English) was first published in 1936 as a Dutch language counterpart to Le Moustique, now Télémoustique. During World War II between 1940 and 1944 Humoradio was not published. In 1958, when television started to reach a larger audience in the country, the magazine was renamed as Humo. The magazine is published on a weekly basis.
HUMO as it is recognized today started emerging from 1969 on, when Guy Mortier became its chief editor. He gave the magazine its playful comedic tone, put more emphasis on articles about rock music and shaped it into a magazine that appealed to a left-wing, progressive audience. During Mortier's term many classic columns, interview series, annual cultural events and comic strips that are still considered to be part of "Humo" today saw the day of light. Among those is the annual HUMO's Pop Poll, organized since 1967, which lets readers elect their favorite people, radio shows, TV shows, music groups,... of the year. Another recurring event is Humo's Rock Rally, an important Belgian contest for young rock bands,. Humo also sponsors the Rock Werchter festival since its conception in 1977. In 2003 Mortier retired.