Operation Keystone equals maintenance readiness
377th Support Maintenance Company Soldier, Spc. Hasan, works to replace the sight glass for a hydraulic reservoir on a piece of equipment at Equipment Concentration Site (ECS) 67, Fort McCoy, Wis., Jan. 9, 2026. The unit is part of Operation Keystone, enhancing maintenance readiness by supporting U.S. Army Reserve Support Maintenance Companies in partnership with the 88th Readiness Division's ECS's.