The crossword solution for the term WELCOMING SIGHTS is MATS, which stands for 'Military Air Transport Service'. This was a branch of the United States Air Force that was established in 1948 and provided airlift services to the military. The service was disbanded in 1966 and replaced by the Military Airlift Command. MATS was responsible for transporting personnel, equipment, and supplies around the world, making them a welcome sight for many military personnel.