The sidelining of the Abrams reflects evolving battlefield tactics where drone use has made it virtually impossible for them to maneuver without detection.
The Army is seeking approval for its short-range air defense requirements, which will solidify a program of record for the rapidly developed capability.
Pfc. Cesar Gonzalez, 21, suffered a "medical emergency" during an on-post training exercise Oct. 20. The exact cause of his death is under investigation.