Staff Sgt. Gregorio Santoni checks the zero coordinates for his section's M-198 155 mm howitzer, on Vieques Island, Puerto Rico, on Jan. 20, 1998, for Joint Task Force Exercise 98-1. More than 30,000 U.S. military personnel are participating in the exercise which is testing joint forces on their ability to deploy rapidly and conduct joint operations during a crisis. All branches of the armed forces are training side-by-side using the latest advances in technology in a simulated high-threat environment that involves air, naval and ground operations. Santoni's unit, B Battery, 1st Battalion, 377th Field Artillery Regiment (Air Assault), Fort Bragg, N.C., will conduct a joint, live fire exercise with the 26th Marine Expeditionary Unit of Camp Lejeune, N.C.