When officers and enlisted swear their oath in joining the Army or Air National Guard, they vow to "support and defend the Constitution of the United States and of the State/Commonwealth/District/Territory" where they are serving.
Today, Talking Points Memo reports on three State National Guards that are doing just that by refusing to break the laws of their States in order to provide same-sex 'marriage' benefits:
The Obama administration determined this month that married same-sex couples are entitled to spousal military benefits, but three GOP-controlled states - Texas, Louisiana and Mississippi - have refused to grant them to members of their National Guards. Now advocates are urging the federal government to push back. [...]
A Mississippi National Guard spokesman told the news outlet that the unit was "following state law," which, like laws in 30-plus other states, bans same-sex marriage.
You can read more here from the Associated Press.