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:

Impeach him already!!!
Merry Christmas to all Vets past present and future
Wrong!!!! Get him out ! Congress do your job you cowards
Leave the country ovomit dead or alive I don’t care just leave
I can’t say Obama without throwing up
Why did the eastern world terrorist hate christianity and western world ideologies?
Let them try and enforce this in an American court, We the people of America support you 100% and since you are fighting to protect me and my family you can say MERRY CHRISTMAS as much or often as you like.
Merry Christmas Mr Obama…
Go to hell Obama
M e r r y C H R I S T M A S