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:

No
Angela Howard Hanson PRAISE JESUS!!!!!
Please leave office yesterday. One weak weak muslim
I Say All Military Personnel must be allowed to Say Christmas Merry Christmas !! the illegal Obama is a foreign person not allowed to be President.
Hey obama, Merry Christmas
Merry Christmas you thug.
B. S.
Remove from office Xmas day!
This crazy, progressive, fascist president cannot tell ANYONE what words they can or cannot use. Get over yourself, Hussein!
Afraid I’d have to break that rule.