The Army Upgrades its Air Defense Capabilities With an Eye to the Future Share This: Asian Military Review In an effort to update and upgrade its air defense systems, the U.S. Army delivered the first four operational Stryker anti-aircraft vehicles. The 5th Battalion, 4th Air Defense Artillery Regiment (5-4 ADA), under the 10th Army Air and Missile Defense Command, is the first battalion in the Army to test, receive, and field the Mobile Short Range Air Defense (M-SHORAD) system. The 5-4 ADA is based at Shipton Kaserne in Ansbach, Germany. The M-SHORAD is placed on the lightly armored 8×8 Stryker vehicles. These variants are fitted with an autocannon and a missile launcher capable of firing Hellfire or Stinger anti-aircraft missiles. They will replace the 1980s-vintage Avengers, a variant of the 4×4 Humvee that can only fire Stingers. The Avenger was less mobile and much more vulnerable.