Final answer:
The drill command that develops confidence, self-reliance, and assertiveness is "Take charge," allowing the individual to lead and make decisions.
Step-by-step explanation:
The drill command that helps develop confidence, self-reliance, assertiveness, and enthusiasm by making the individual recall, give, and execute proper commands is "Take charge". This command tasks the individual with stepping into a leadership role, making decisions, and issuing orders that others will follow. It promotes the qualities of decisiveness and initiative, echoing training philosophies that underline the importance of discipline and cohesion within a military unit, as seen in various military doctrines and anecdotal evidence from historical and contemporary armed forces training practices.