Sending mail to a CMR address is just like sending mail to any other US location using the United States Postal Service (USPS) – same cost to mail letters and packages.
Packages do require a US Customs label.Visit the USPS website for how to use the online “click & ship” service. https://www.usps.com/
The mailing address format is:
(Rank) First & Last name
CMR xxx, BOX xxxxx
APO, AE xxxxx-xxxx