The Obama administration has directed the military to not allow personnel to say “Christmas”, in spite of the holiday’s status as a federally-recognized holiday.
The reason given by armed forces officials is that not everyone celebrates Christmas and that out of respect for them, military members should refer to Christmas celebrations simply as “holiday”-themed festivities.
This prohibition comes in the context of a wider push for political correctness in society in general and the military in particular, as evidenced by the recent reprimanding of Navy Chaplain Wes Modder for simply discussing religion, as chaplains are wont to do, with military personnel.
See how servicemen have reacted to not being allowed to say Christmas at the link below:

Well I would have to request Captains Mask because it is Christmas and I will always say Merry Christmas! His pen does NOT over ride Christ!
Another slap in the face to Christians and Military. Merry Christmas everyone an Happy Thanksgiving. If your offended don’t read my messages!!!!
Screw you. Merry Christmas to all service members.
for him to do all the things he is doing and getting away with it only shows that 85% of people in this country are communists because no one is trying to stop him
Sounds like the Devil is giving orders via Obama..
He can kiss where the sun don’t shine. We will always merry Christmas.
Muslim
obama cannot dictate what we can or cannot say.
Everyone I know in the military and retired and Guard etc. ..will say Merry Christmas no matter what and not even Obama will stop that God given Right
I’ll bet the Military can’t wait to give him the boot!!!