A-2 jacket

The Type A-2 leather flight jacket is an American military flight jacket originally invented and developed for and closely associated with World War II U.S. Army Air Forces pilots, navigators and bombardiers, who often decorated their jackets with squadron patches and elaborate artwork painted on the back. Sometimes casually referred to as a bomber jacket, its original designation was "Jacket, Pilot's (summer)", and its wartime usage was limited neither to pilots nor to bomber crews.

History

The Type A-2 flying jacket was standardized by the U.S. Army Air Corps as the successor to the Type A-1 flying jacket adopted in 1927. The Type Designation Sheet lists the dates for Service Test as September 20, 1930, and Standardized (adopted as standard issue) on May 9, 1931. The military specification number for Type A-2 is 94-3040. The Drawing Number was given as 31-1415, but the spec. labels found in the jackets themselves show this to be 30-1415.

On April 27, 1943, Type A-2 was declared Limited Standard, meaning that only replacements for in-service units could be ordered. New units would now be supplied with cloth-shelled jackets such as Types B-10 and B-15.

A2

A2, A02, A002, A², A.II or A-2 may refer to:

Media

Military

List of County-Designated Highways in Michigan

The County-Designated Highways in Michigan comprise a 1,241.6-mile-long (1,998.2 km) system of primary county roads across the US state of Michigan. Unlike the State Trunkline Highway System, these highways have alphanumeric designations with letters that correspond to one of six lettered zones in the state. The CDH system was created in 1970 in response to the business concerns of a woman from Saugatuck. Her one-woman crusade in the 1960s started after the highway in front of her motel was turned over to local control as a county road and removed from state highway maps when the nearby freeway opened. After nearly a decade of efforts, the first two test highways were designated, one each in the Lower and Upper peninsulas of the state and included on the 1970 state highway map. The CDH system was created and expanded in scope c. October 5, 1970, after it was approved by the County Road Association of Michigan and the State Highway Commission.

A-0 System

The A-0 system (Arithmetic Language version 0), written by Grace Hopper in 1951 and 1952 for the UNIVAC I, was the first compiler ever developed for an electronic computer. The A-0 functioned more as a loader or linker than the modern notion of a compiler. A program was specified as a sequence of subroutines and arguments. The subroutines were identified by a numeric code and the arguments to the subroutines were written directly after each subroutine code. The A-0 system converted the specification into machine code that could be fed into the computer a second time to execute the said program.

The A-0 system was followed by the A-1, A-2, A-3 (released as ARITH-MATIC), AT-3 (released as MATH-MATIC) and B-0 (released as FLOW-MATIC).

The A-2 system was developed at the UNIVAC division of Remington Rand in 1953 and released to customers by the end of that year. Customers were provided the source code for A-2 and invited to send their improvements back to UNIVAC. Thus A-2 was an early, and perhaps the first, example of free and open-source software.