What phrase is used to initiate a fire mission?

The phrase "Fire for effect" is used to initiate a fire mission after the adjustments to the target area have been confirmed and the observer is ready to engage the target with maximum firepower. This command indicates to the firing unit that they should fire a pre-determined number of rounds to achieve the desired outcome against the target, rather than continuing adjustments or spot checks. This term is vital because it moves the mission from the observation phase into the execution phase, allowing for the effective concentration of fire on the target.

The other options present different commands within the fire support process. "At my command" is primarily used to control timing rather than indicate the start of a fire mission. "Commence fire" is a generic phrase that can be used but is not the standard terminology in military operations, while "Adjust fire" refers to the phase where adjustments are made to the initial fire rounds, not the final command to engage the target with a full fire mission. Understanding these distinctions is crucial for effective communication and operational efficiency within fire support operations.