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:

UFA MEA!!!
TRUMP/Cruz 2016
Merry Christmas Mr. obama from a vet.
where do you guys come up with this stuff?not true… think about that for a minute…. if it were true… who going to obey it?
He can’t tell Americans what to say
Merry Christmas president obama. You will not get away with this.
Your stupid order won’t do jack no one cares! Pound that own up your a**!!!
Freedom of speech….MERRY CHRISTMAS..
Obama is not only a true scumbag, but a muslim scumbag to boot.
W.T.H.