For same-sex military couples married before or on June 26, 2013, the effective date of benefits and entitlements is June 26. However, for same-sex couples married after June 26, their effective date of benefits and entitlements is the actual date of marriage.
All Army spouses whether in a same-sex or opposite-sex marriage are eligible for benefits. Soldiers are responsible for updating their personnel records with the appropriate spouse information.
The same procedures used for adding an opposite-sex spouse to the Defense Enrollment Eligibility Reporting System, called DEERS, and acquiring identification cards are also used for adding same-sex spouses. A valid marriage certificate is the required document that must be presented for proof of eligibility for Real-Time Automated Personnel Identification System, called RAPIDS. The marriage certificate is also required for proof of eligibility for DEERS benefits and entitlements.
Soldiers assigned to duty stations within the continental United States will be afforded up to seven days of non-chargeable leave to travel to a state where marriage is legal, while those outside the United States may receive up to 10 day of leave.
From www.army.mil website