Which of the following is NOT one of the prefire checks for the M777A2?

The prefire checks for the M777A2 Howitzer are crucial for ensuring that the weapon system is ready for operation and can perform reliably and safely. Each component plays a significant role in the firing process, which is why the checks are comprehensive.

The checks include verifying that the breech functions as intended, confirming that the firing mechanism is properly installed, and ensuring that the obturator pads are in place. These elements are essential for the howitzer to operate correctly and safely during firing.

The option regarding the calibrated azimuth does not typically fall under the standard prefire checks for the M777A2. While azimuth calibration is vital for targeting and accuracy during artillery operations, it is not directly part of the prefire checks. Prefire checks are more concerned with the mechanical and safety functionalities of the weapon itself rather than the firing data, which is usually part of the broader operational planning and setup process.

Understanding this distinction clarifies why the calibration of azimuth, while important for successful operation, is not categorized as a prefire check for the M777A2.