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:

This is plain WRONG!
they should say it any way what can he do to that many
as far as im concerned obama dont have that right.
merry christmas obama
Obama, you are a filthy murdering pig…….you need to get out of OUR Country…..take your terrorists and you welfare leeches with you.
Send Barry a card before he leaves the White House “Merry Christmas”. It’s Jesus’s birthday!!!!!
Seems to me he’s getting a bit too bold for his own good! He’s been trying to gag Americans for a long time, now, and it hasn’t worked before , and it won’t now!
GFY
How will he like St Peter?
Can you say 1st amendment