Final answer:
The technical order (TO) improvement recommendation that requires a reply within 45 days is TO-00-1-1.
Step-by-step explanation:
The technical order (TO) improvement recommendation that requires a reply within 45 days is TO-00-1-1. This TO specifies that any recommendation made by an individual that requires a reply must receive a response within 45 days. It is an important procedure to ensure timely communication and implementation of improvement suggestions.