I was thinking too you don't want to get the recipient into trouble either.
APO/FPO restrictions.
Restrictions
Please do not send mail addressed to "Military Mail" or "any soldier" or "any sailor" or "any service member," or any other formulation that does not name a specific individual. Such mailpieces will be rejected and returned to the sender. While it was a tradition for the USPS to allow anonymous mail to be sent to random troops as a morale booster, DoD has requested it be ended due to heightened security concerns.
All packages must be 70 lbs. or less
Packages cannot exceed 130 in. combined length and girth.
You cannot send any item restricted by the United States Postal Service. In addition, you cannot send perishable foods.
Further, you cannot send any items that are restricted by the unit's host country, regardless of their mailability by the USPS. Any mailpieces being sent to troops deployed in the Middle East or Afghanistan cannot contain articles contrary to the Islamic faith (exception: single copies of non-Islamic religious texts and religious objects intended for personal use are permitted), anything that could be considered pornographic or politically inflammatory, or pork/pig-derived products.
You can see the full restrictions in the USPS Rate Calculator, or by contacting your local Post Office, calling 1-800-ASK-USPS or contacting the Military Postal Service Agency at
http://hqdainet.army.mil/mpsa.
Please remove any batteries from battery-powered items (radios, shavers, media players) in case they accidentaly get switched on in transit. You can wrap them securely and place them with the item.
All packages must have complete customs forms attached if being sent to a APO in a foreign country.