The Pyros, previously referred to as the Small Tactical Munition (STM), is a weapon developed by Raytheon, designed to be used by UAVs. Raytheon successfully conducted flight tests in October 2010, and it may be used to arm the AAI RQ-7 Shadow. It weighs , and originally had a warhead. On April 18, 2011, Raytheon successfully tested a new warhead. Though lighter, the new warhead had a significantly improved blast-fragment capability.