1) US satellite 2) WWII org 3) Abstinence group 4) Advanced technology satellite 5) Anti-drinking org 6) Anti-liquor org 7) Army group 8) Army transport group 9) Bowlers, to a cockney 10) Cadillac compact 11) Cadillac model 12) Cockney headgear 13) Janis Ian hit 14) Much-used Twitter symbols 15) Prepositions Found on https://www.crosswordclues.com/clue/ats
(Applications Technology Satellite ) ATS 6 A series of NASA satellites designed to explore and flight-test new technologies and techniques for communications, navigation, and weather satellites. Among the areas investigated during the program were spin stabilization, ... Found on http://www.daviddarling.info/encyclopedia/A/ATS.html
Auxiliary Territorial Service (organized in 1941 for women serving in the British army; became part of army in 1949 as WRAC). Found on https://www.infoplease.com/dictionary/ats