Final answer:
The PAC3 Missile Round Trainer (MRT) Canisters are marked and identified with a unique serial number and various identification codes according to TM 9-1410-1600-12.
Step-by-step explanation:
The PAC3 Missile Round Trainer (MRT) Canisters are marked and identified according to TM 9-1410-1600-12. Each MRT canister is marked with a unique serial number and various identification codes to ensure proper tracking and accountability. The canisters may also display additional markings such as caution labels or warning signs to indicate the handling and storage requirements.