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

The command that signifies that the specified number of rounds in the fire for effect has been fired is "Rounds Complete." This command is crucial in the fire support operation as it indicates to the forward observer and the receiving unit that all rounds fired as part of the fire for effect have impacted. This confirmation allows the fire support team to assess the effectiveness of the fire mission and determine any necessary adjustments or follow-on actions.

In contrast, the other commands serve different purposes: "Splash" is used to indicate the moment of impact for a specific round, particularly when indicating that the effects of the round will be seen imminently. "Shot" indicates that a round has been fired but does not signify how many rounds have been fired or if the mission is completed. "End of Mission" signifies the end of the entire fire support mission but does not specifically confirm the number of rounds fired or their completion, which can lead to potential ambiguity about the status of the fire support operation. Therefore, "Rounds Complete" is the most accurate command for expressing the completion of the specified number of rounds in the fire for effect.