airspace coordinating measures – (DOD) Measures employed to facilitate the efficient use of airspace to accomplish missions and simultaneously provide safeguards for friendly forces. Also called ACM. (JP 3-52) Referenced in FM 3-09, FM 3-52, FM 3-99, ATP 3-01.85, ATP 3-01.87. ATP 3-09.34, ATP 3--52.1, ATP 3-52.2, ATP 3-60.2, ATP 3-91.1.