The term WRECK PARTY AFTER HILL EXERCISE can be summarized as a TORPEDO, which is a seven-letter weapon used in naval warfare. Torpedoes are self-propelled missiles that are designed to detonate on contact with a target, usually a ship. They are typically launched from submarines, surface ships, or aircraft, and can travel at high speeds underwater. Torpedoes have been used since the 19th century and remain an important part of modern naval warfare.