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:

BS freedom of speech
people wake up merry chirstmas
WHAT A JERK!
civil unrest is coming Obama just keep pushing and the people of the country will push back
And Merry Christmas to the world!
obama hates America and everything America stands for.
Why are so many people so blind? IMPEACH NOW!
Please someone drop a plane on that Muslim terrorist Obama’s head and do the world a favor.
Freedom of speech doesn’t matter! Religious freedom ! Free will doesn’t matter! Treason apparently doesn’t matter either! Prepare to be told what to think and do !
https://youtu.be/Lg5-v0SPRgk
I will always say it