What FDC command does the FO receive after sending a CFF as "At My Command"?

When the Forward Observer (FO) sends a Call for Fire (CFF) as "At My Command," the command they receive from the Fire Direction Center (FDC) is "Ready." This command indicates that the firing unit is prepared to fire but is waiting for the FO to give, at their discretion, the order to commence firing.

The "Ready" command serves to confirm that the unit is set and capable of delivering the requested fire support when directed. The situation implies that the FO has control over when the fire mission will commence, establishing a clear chain of command and operational flexibility for the FO to time the engagement to coincide with tactical needs.

Other options like "Laid" or "In Position Ready to Fire" may indicate different statuses or actions of the artillery unit but do not directly correspond to the timing mechanism that "At My Command" suggests. "Aimed On" typically refers to the status of being on target rather than signaling readiness at the FO's discretion.