Tracking ship
…Marshal Krylov, 1990 There are currently only two active Instrumentation Ships in the U.S. Navy inventory: USNS Invincible (T-AGM-24) and USNS Howard O. Lorenzen (T-AGM-25). The former is now in the inactive fleet. The latter was delivered in January 2012 to replace USNS Observation Island (T-AGM-23) in 2014. Most of the…