A chaplain marrying a couple of same sex, in accordance with a state law, does not run into conflict with this. The chaplain, first, is not a state, territory or possession of the US. He is not "required" to give effect to anything to do with any of the items listed. If he is performing a legal marriage (meaning the ceremony will have the effect under state law of making the couple married) on a federal reservation within a state and that state recognizes same sex marriage, there is no conflict.
Here's the scenario:
1. State issues same sex marriage license - fine and legal
2. Couple seeks chaplain to officiate the wedding
3. Guidance says perform ceremony
4. Chaplain is a federal official, a member of the DoD and the DoD is an agency of the United States.
5. The law reads:
SEC. 3. DEFINITION OF MARRIAGE.
(a) In General.--Chapter 1 of title 1, United States Code, is
amended by adding at the end the following:
``Sec. 7. Definition of `marriage' and `spouse'
``In determining the meaning of any Act of Congress, or of any
ruling, regulation, or interpretation of the various administrative
bureaus and agencies of the United States, the word `marriage' means
only a legal union between one man and one woman as husband and wife,
and the word `spouse' refers only to a person of the opposite sex who is
a husband or a wife.''.
6. Chaplain determines that as a DoD member, he cannot break this law and refused to marry the couple.
Scenario #2
1. Chaplain performs wedding above.
2. Couple applies for base housing, dependent ID card, BX privileges, medical care at base hospital, etc.
3. Couple is denied. Base is covered by federal law. According to Sec. 3, there is no marriage or spouse from a federal viewpoint. Couple must live off base. BAQ at single rate.
Scenario #3
1. Couple is stationed in NY.
2. Couple is transferred to TX.
3. The law reads:
``No State, territory, or possession of the United States, or Indian
tribe, shall be required to give effect to any public act, record, or
judicial proceeding of any other State, territory, possession, or tribe
respecting a relationship between persons of the same sex that is
treated as a marriage under the laws of such other State, territory,
possession, or tribe, or a right or claim arising from such
relationship.''.
Now they aren't married now. it is not recognized by either the federal government (DOMA) or the state (State law).
Scenario #4
1. Couple is stationed in NY
2. One member is sent extended TDY to Afghanistan.
3. Other member returns to stay with his/her family in TX
4. They aren't married now.
Scenario #5
1. Couple is transferred overseas to Australia.
2. They aren't married now.
So where I'm coming from is that:
1. A chaplain shouldn't have to make a judgement call.
2. Given the different outcomes to the scenarios above, he may have a moral obligation against performing the marriage under military auspices.
3. If the military allows same-sex marriages, they should damned well protect what they allow. Thats an additional mental burden no member should have to carry. Carry it into a combat zone and someone is going to get killed.
4. DOMA oversteps the bounds of the 10th Amendment.