I had never heard of this, though it seems to have been around for a little while.
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The following may be of interest to you or someone you know:

If you are active or reserve military, and your service was extended under stop loss between September 11, 2001 and September 30, 2009, you're eligible for $500 per month in retroactive pay. Veterans and beneficiaries of servicemembers are also eligible.

Learn more about retroactive stop loss pay and find out how to apply http://www.defense.gov/home/features/2010/0710_stoploss. If you're eligible, you must submit a claim by October 21, 2012.
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Looks legit.

USMCFLYR