http://blog.reidreport.com/2009/10/harry-truman-barack-obama-and-the-mythic-executive-order/I just found this article looking for the specific circumstances of the Truman executive order that desegregated the military. The truth is a bit more complicated, and though I still believe Obama could be doing more on this front, something Joy Reid does point out, the "stroke of the pen" language I've used here isn't actually true.
That’s not to say that gay rights activists shouldn’t advocate for their cause, but if they’re going to use history as a cudgel over this president’s head, they should at least know the history. Saying President Obama could institute open service with the stroke of a pen is both historicaly inaccurate, and politically ignorant. It ignores the key facts about Truman’s action:
1. Integration of the military was initiated by the military itself, not by the president;
2. Truman’s order did not immediately desegregate the military; and
3. Truman did not desegregate the military at the beginning of his term, when he was at his most popular, having succeeded a popular Democratic president and won the war (by nuking Japan.) He waited until the end of his term, despite having had the military’s internal report on desegregation on his desk for three years. In fact, it was only in what amounted to the final hour of his presidency (again, he very nearly lost the election) that Truman acted. No one knows why, especially since black soldiers had distinguished themselves as patriots during the war, and one would think that the immediate aftermath was the time to act. But wait he did. Sometimes, the politics of the moment requires a president to wait.
Lots, lots more at the link. It's one of the best defenses of Obama's track to repeal DADT that I've read.
ETA: And I thought I would add that personally I know that ending DADT isn't going to be an overnight thing, any more that desegregation was or getting out of Iraq would be. But the process needs to get started and keep moving.