[5] During the Mexican border emergency of 1916, Troop B was among the Washington units called up and "performed the considerable feat of recruiting up to wartime strength and assembling at their mobilization camp in six days".

[6] In late July, Sergeant W.R. Tyree commented on conditions in Calexico in a letter to his wife: ... an extension of Calexico, is Mexicali, one of the most wicked little towns in all Mexico ... [Baja California Governor Esteban] Cantú's best band is stationed in Mexicali, with his troops there, scarcely half a mile from our camp, and we hear it almost every evening.

[6] Troop B remained on duty in California until early 1917 and was mustered out of federal service in Vancouver, Washington, in February of that year.

[8] Within a few months after its return from Mexican border service, Troop B was again mobilized due to United States entry into World War I.

[9] On September 19, 1917, it was redesignated for federal service as Company B, 116th Trains, Headquarters, and Military Police, 41st Division and deployed to France.

[9] Troop B was assigned to the 58th Machine Gun Squadron of the 24th Cavalry Division in June 1921; as of 1922 it reported an actual strength of four officers and 95 men.