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 all the Muslims including our President.
Haven’t seen anything yet in message traffic
Do not believe this statement. Need more proof.
MERRY CHRISTMAS to all our military and uniformed services ands G.F.Y to our girlieman POS in Chief.
fu obama i can say anything i want to say u fagget
MERRY CHRISTMAS, MERRY CHRISTMAS, MERRY CHRISTMAS! MERRY CHRISTMAS TO ALL OUR MILITARY, from The President of the These United States. Oh yeah Merry Christmas, you nasty animal (from Home alone).
He has no right to tell anyone what they can say or not say. WHAT HAPPENED TO OUR FREE SPEACH.
To late. BTW There is a darkness spreading over our society because the people who live in this country have figured out that what they want is not of any concern to people in Washington.
Go back where you came from. It’s nice and hot there.
Say it ends anyway!!…