This definition appears somewhat frequently
See other definitions of ACE
Samples in periodicals archive:
Command Element. Before a combat, humanitarian or resupply operation can be carried out, it must first be conceived. Led by a senior commander and staff, the Command...
In the United States Marine Corps, the command element (CE) is the command and control force of a Marine Air-Ground Task Force (MAGTF). It provides C3I for the MAGTF.