This from U.S News And World Report:

Still a Bargain at $150,000 Each
Sick and tired of losing experienced special forces to private security firms waving bricks of dollars at soldiers returning from Iraq and Afghanistan, the Pentagon recently offered $150,000 re-enlistment bonuses to SEAL s and Green Berets with 19 years or more of service. It worked. Gen. Doug Brown, head of the U.S. Special Operations Command, reveals that 601 people took the tax-free bonus that expired last month. Don’t choke on the price: Training one soldier tops $300,000.

I would think the total training investment in a veteran special ops person is a lot more than $300K.