The 161st Infantry Regiment is a ceremonial infantry regiment of the United States Army and the Washington Army National Guard. It is the oldest unit in the Washington Army National Guard tracing its lineage to the separate Infantry Companies of the Territorial Militia. Its 1st Battalion is a stryker-based element of the 81st Stryker Brigade Combat Team consisting of three stryker infantry companies and one headquarters company, with its headquarters in Spokane, Washington.

The Washington Army National Guard is a component of the United States Army and the Washington National Guard based in Washington. The history of the Washington Army National Guard dates back to 1854 with formation of the Washington Territorial Militia. The command is headquartered at Camp Murray in Pierce County. It consists of 6,200 soldiers in two brigades and various smaller units located throughout the state.