Late last week on June 27, the United States Navy sank the former USS Juneau, an Austin-class amphibious transport dock ship during a sink exercise or SinkEx during Exercise Valiant Shield. The ship, which had entered service in 1969 and retired in 2008, was sunk nearly 400 km off the coast in the Mariana Islands Range Complex following coordinated strikes from air, surface and submarine assets. The ship had taken part in the Vietnam War and Operation Desert Storm. The War Zone has reported that a Ticonderoga-Class cruiser the former USS Mobile Bay in the upcoming Rim of the Pacific or RimPac exercise.A SinkEx is a naval drill in which decommissioned warships are deliberately sunk using live weapons. These exercises are carried out to test the effectiveness of missiles, torpedoes and bombs against actual ship structures. These exercises provide data based in real world scenarios that a simulation cannot replicate due the number of variables involved.Navies sink their own ships for several reasons. First, it allows them to validate weapon systems by studying how ordnance impacts real hulls. This helps planners refine tactics and assess survivability. Second, it provides realistic training for pilots, submariners and surface crews. These exercise also help demonstrate the capabilities of weapons, demonstrating operational readiness and technological strength, which can act as a deterrent.“This SinkEx provided an outstanding opportunity for our joint team to integrate capabilities across domains, honing the lethal precision and coordination essential for high-end maritime operations in the Pacific theater,” said Rear Admiral Eric Anduze, commander of Carrier Strike Group 5 and Task Force 70 of the US Navy .The Indian Navy too has conducted these exercises. The navy has used as targets INS Hosdurg, INS Ranjit and INS Godavari in similar exercises. INS Hosdurg was sunk by a Sea Eagle missile fired from an air force Jaguar deep strike penetration aircraft. A SinkEx is a vital training tool that helps test weapons, refine tactics and train personnel.