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:

Merry Christmas to our Military
LOSER!!!
WTF
Snopes.com says this is false….check out the website below:
http://www.snopes.com/obama-military-christmas-ban/
The ultimate Grinch. Merry Christmas!
Well Merry CHRISTmas Obama. Remember, one day EVERY knee shall bow – even yours
http://www.snopes.com/obama-military-christmas-ban/
Yes we can. Quit lying.
Mr. President, I celebrate Christmas, and you just discriminated against those in the military who celebrate it, too. This is one order that I would ignore. I have a right to say Merry Christmas.
Merry Christmas ,Obama !!!!!