This event is being compared to the moment when President Truman abolished racial segregation in the U.S. military with his executive order 9981 on July 26 1948. This corresponded to the Jupiter-Uranus opposition of 1947-1948.
This also feels similar to the archetypal vibe of the moment women were granted the right to vote here in the United Sates when the 19th amendment was ratified on August 18th 1920. That celebrated (Jupiter) moment of freedom (Uranus) occurred under that years Jupiter-Uranus conjunction. Many other great examples can be found in Tarnas' book.
The repeal of Don't Ask Don't Tell is also consistent with our current collective Uranus square Pluto alignment. This is a long alignment which started to get strong in 2008 and will last through the entire coming decade. The last time we had a Uranus-Pluto alignment was the conjunction that lasted from 1960-1972 and one of the big themes of that alignment was the sexual revolution of the 1960s. Uranus is the archetype of revolution, and Pluto is the archetype that has the most to do with sexuality. When the two come together geometrically we regularly see periods in history when we see progressive change in the area of human sexuality. This is another cycle that Tarnas focuses on in Cosmos and Psyche, and many examples of this theme can be found there, but clearly we are seeing much evidence that this current Uranus-Pluto square is going to be a period when huge focus will be on the area of LGBT rights and freedoms, from all of the focus on gay marriage in recent years to this breakthrough in gay rights for members of the military.