Final answer:
The M9 pistol is covered by Training Circular TC 3-23.35, which offers comprehensive guidance on the operation, maintenance, and training for the standard military sidearm.
Step-by-step explanation:
The TC (Training Circular) that covers the M9 pistol is TC 3-23.35 (previously designated as FM 3-23.35). This manual provides guidance on the operation, maintenance, and training for the M9 pistol, which is the standard sidearm in service across various branches of the United States military. The training circular details proper handling, firing techniques, disassembly, cleaning, and troubleshooting procedures for the M9.