The RUM-139 Vertical-Launch Anti-Submarine Rocket (VL-ASROC or VLA) is an anti-submarine missile in the ASROC family, currently built by Lockheed Martin for the U.S. Navy.
Beginning in 1996, the missile was replaced by the newer RUM-139A and subsequently the RUM-139B. The torpedo remained the Mark 46, though at one time an improved variant using the Mark 50 was proposed and then canceled.
In October 2004, the RUM-139C began production with the Mark 54 torpedo. The Mk 54 Mod 0 torpedo achieved Initial Operating Capability in 2010, and the U.S. Navy is transitioning its VL-ASROCs to use the Mk 54.