Mr. Forman has his timeline wrong. Maybe he is confused because Obama did not just suddenly announce the policy change out of nowhere like his successor tends to do. Instead, he started the process in 2015 and went to great lengths to get Pentagon feedback on issues and implementation. 
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In the first few years of his Presidency, Obama was a little busy dealing with the effects of the Great Recession and Economic Collapse and thousands of our soldiers dead and wounded in the wars in the Middle East. Despite that, he worked with Congress to eliminate the legal underpinning of DADT in 2010, then worked with the Services to create a smooth transition when he eliminated its last vestiges. In 2011, he also started the process of expanding the combat roles available to women, culminating in opening roles across the board.
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These are not the actions of the moral coward Forman portrays, but rather the responsible actions of a man making significant, lasting changes.