519th

The 519th is a designation that has been used by several military units and companies across different countries and time periods. In the context of the United States military, the 519th was a unit that served during World War I.

During World War I, the 519th was an infantry regiment of the United States Army. It was part of the 129th Infantry Brigade, 66th Division. The regiment was mobilized in August 1917 and shipped out to France in June 1918. It participated in several battles, including the Allied victory over Germany. After the armistice in November 1918, the regiment was demobilized.

In addition to its usage in the context of World War I, the number 519 has also been associated with various other military units and companies around the world. For instance, the 519th Military Police Battalion was a unit of the United States Army that operated in several countries over the years. Similarly, 519 Designated Missions Squadrons (519 DMS) were a type of air defense unit in the Royal Air Force, which was tasked with providing air defense for critical or high-priority targets.

The 519 designation has also been associated with electrical and electronics engineering, with the IEEE 519 standard setting out the limits for harmonic distortion in power systems.