I found these “cartridges” while scuba diving off of Fort H.G. Wright- Fishers Island - New York. Does anyone recognize these things or can they identify them? Rifle cartridge?
Fort H. G. Wright was built as part of the large-scale Endicott Program, which replaced US coastal defenses. The fort was designed and built by the Army Corps of Engineers, the weapons were designed by the Army Ordnance Corps, and the forts were (by 1907) garrisoned by the Coast Artillery Corps. The fort was active in WWI and WWII, deactivated in 1947, and abandoned in 1948 with all guns scrapped. In 1949 the Naval Underwater Sound Laboratory established a facility on the island.