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:

omg
Really? You want a comment? How about this………up yours OBAMA
HOw dare he??? Our military can and will say “Merry Christmas” if hey choose.
Up his
That POS !!!!
They can say whatever they want, its freedom of speech
FY! They protect us NOT YOU! They can say whatever they want!
Merry Christmas, Merry Christmas, Merry Christmas, repeat, repeat !!!!
What the Hell Is wrong with you !!!!
I would say it anyways. Per Freedom of speech order