From the Iraq and Afghanistan Veterans of America:

After weeks of uncertainty, the Defense Finance and Accounting Service will start issuing retroactive stop-loss payments on Dec. 16, officials said. However, most people who have applied for the backpay should not expect to get paid by Christmas. The Army estimates about 120,000 people are eligible for $500 for every month they were held beyond their initial end of service between September 2001 and September 2008.