JSP 3-09.3: Close Air Support: ...
US Army describes close combat attack (CCA) as a hasty or deliberate attack by Army aircraft providing air-to-ground fires for friendly units engaged in close combat as part of the Army combined arms team. Due to the close proximity of friendly forces, detailed integration is required. Due to capabilities of the aircraft and the enhanced situational awareness of the aircrews, terminal control from ground units or controllers is not necessary. CCA is not synonymous with close air support (CAS).......
For further guidance on US Army helicopter operations and associated tactics, techniques, and procedures for CCA, refer to Field Manual (FM) 3-04.126, Attack Reconnaissance Helicopter Operations........