Who serves as the Executive Officer (XO) of the command?

Understanding the role of the Executive Officer (XO) in a command is crucial for this question. The XO is the second-in-command and is responsible for the day-to-day operations of the unit, making sure that all tasks are carried out efficiently and effectively.

In this instance, Captain Castro serves as the Executive Officer because, typically, the Captain holds the top leadership position, while the Executive Officer directly supports them. The XO often oversees the staff's operations and serves as a liaison between the crew and the commanding officer.

Typically, positions like Command Master Chief and other ranks, such as LCDR, do not fulfill the duties of an XO. Command Master Chiefs focus on enlisted personnel and their welfare, while LCDRs, being junior to Captains, do not usually hold command positions on their own. Captain Uwing may perform a role but does not hold the title of Executive Officer in this context. Therefore, Captain Castro is the most fitting choice for the Executive Officer of the command.