FORT MYER, Va. (April 8, 2025) — Caisson Detachment, 3d U.S. Infantry Regiment (The Old Guard) is riding into modernization with a new saddle. The detachment is embracing innovation while ...

2 - To sink the caisson, seven-ton blocks are placed atop its roof. Wooden pilings guide its descent, and a passageway is left in the middle for stairs. Two 215-foot workboats are used to support ...