The Rosette First Troop, also known as the Philadelphia City Cavalry, is a historic military unit based in Philadelphia, Pennsylvania. It was established in 1774 and is one of the oldest continuously serving military organizations in the United States. The troop played a significant role in various conflicts throughout American history, including the Revolutionary War, the War of 1812, and the American Civil War.

During the Civil War, the troop was known for its service in the Union Army. They participated in several key battles, including the Battle of Gettysburg. The troop's distinctive uniform, which includes a dark blue jacket with a red rosette on the lapel, is a well-known symbol of their heritage.

Today, the Rosette First Troop serves as a ceremonial unit, preserving its historical legacy and participating in various civic and military events. It is considered a vital part of Philadelphia's rich military history and heritage.