Which of the following is NOT a requirement before performing the turret ground pattern test?

The requirement that the water tank must be at least ½ full is not a prerequisite for conducting the turret ground pattern test. The focus of this test is to assess the effectiveness and accuracy of the turret's operation, which generally does not necessitate a specific water tank level. Instead, the emphasis is on ensuring that the apparatus is safely positioned, that all equipment is fully functional, and that personnel are wearing appropriate protective gear to ensure safety during the test. Having the tank at that specific level may be a good practice or precaution in certain circumstances, but it is not a formal requirement. This understanding allows operators to prioritize safety and operational readiness over specific water levels when preparing for the turret ground pattern test.