To close your First Command banking account, log in to OnCommand, select the “Messages” link in the top right corner, and send a request to close your account. Please be sure to include only the last four digits of the account you want to close. You can also log in to your First Command MobileCommand app for iPhone or Android to send a secure message. To close an investment account, contact your local Financial Advisor or call 1-800-443-2104.