SAA meaning in Military and Defence ?

The Colt Single Action Army, also known as the Single Action Army, SAA, Model P, Peacemaker and M1873, is a single-action hand gun with a revolving cylinder (a revolver) holding six metallic cartridges. It was designed for the U.S. government service revolver trials of 1872 by Colt's Patent Firearms Manufacturing Company—today's Colt's Manufacturing Company—and was adopted as the standard military service revolver until 1892.

The Colt SAA has been offered in over 30 different calibers and various barrel lengths. Its overall appearance has remained consistent since 1873. Colt has cancelled its production twice, but brought it back due to popular demand. The revolver was popular with ranchers, lawmen, and outlaws alike, but as of the early 21st century, models are mostly bought by collectors and re-enactors. Its design has influenced the production of numerous other models from other companies.

The Colt SAA "Peacemaker" revolver is a famous piece of Americana. The original length of the barrel, issued to the U.S. Cavalry, was 7+1⁄2 inches (with an overall length of 13 inches).