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:

He can’t do that.
How could you wish him a merry Christmas? He doesn’t deserve it !
BS
Derrick Pac prove that he did not say it. Sounds like something he would say
Impeach! Impeach! Impeach!
Up Obama.
Who is he to tell us what to say or not, i would like him to respond to this question on nat- ional television on FOX.NEW
How about him sending warm messages to Muslims on their holidays? This could offend people too!
Stop posting this lying sac of c**p sight. He did not sign an order that the military cant say christmas… you guys do realize this is the internet and you can use your computers to find the truth!
Say it anyway.. Your life is on the line, not his, ( at least not yet.)