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 Xmas to all troops
Christmas!
you are the satan i saw during your elctions
Of this is true….
First Amendment!!
What doesn’t he understand, or I should say what does he understand.
Why is this SOB still alive?
We REALLY need some sort of penalty or punishment for spreading false information on the internet.
God Bless America !Sing Victory To Jesus Christ ! Happy Thanks giving Comeing Up! And Merry Christmas To America.
tell him to jump off a high bridge.