Multiple groups have filed Supreme Court briefs in support of the Defense of Marriage Act:

The Chaplain Alliance for Religious Liberty filed a brief co-signed by 21 endorsers representing more than 2,500 US military chaplains.  The CARL brief accurately notes US troops in general — not just chaplains — will be affected by the “burden on religious liberty” should the military recognize homosexual “marriage.”  CARL had a fairly blunt summary:

the military has no tolerance for racists, so service members who are openly racist are not service members for long.  And if the traditional religious views on marriage and family become the constitutional equivalent of racism, Read more