What command signifies that the number of rounds specified in the fire for effect has been fired?

The command that signifies that the number of rounds specified in the fire for effect has been fired is indeed "Rounds Complete." This command is specifically used to indicate that all of the artillery rounds requested in the fire mission have been successfully delivered. It provides assurance to the forward observer and the fire support team that the expected engagement has been carried out fully.

"Round Complete" serves a crucial function in fire support operations by allowing the artillery units and the requesting unit to synchronize their actions during the mission. Once this command is communicated, the team can assess the effects of the fire and coordinate any necessary follow-up actions or adjustments.

In contrast, "Splash" is announced to indicate when the first round is about to hit the target, serving as a warning to those in the area. "Shot" indicates that a single round has been fired, which conveys that the firing unit has executed the order but does not provide information on the overall mission completion. "End of Mission" typically signifies the closing of the entire operation rather than the completion of the specific round count. Thus, while related, they do not reflect the same specificity regarding the number of rounds fired as "Rounds Complete" does.