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:

what military do we have left? a bunch of illegals in military garb and traitors that do not understand the meaning of Oath
WHO MADE HIM “GOD”?
lol
His time out of hell is hopefully almost over.
This man is an outrage to all western civilization x
One stupid sob
Wow so cold
What a Muslim loser
you bet it is against our freedom of speech, one of the very thing our brave military are fighting for. this should not be. say it any way.
This is Absurd!
Impeach this Traitor and criminal!