Those who chose to stay in the service after 20 years will receive a $50K bonus. This is to help incentive for those with advanced developed skills to stay. The Marines say there is no shortage, but it is important to keep the raider pool trained and skilled. Specifically they are looking for 0372 critical skills operator military occupational specialty, or MOS.

By 7th Army Joint Multinational Training Command from Grafenwoehr, Germany - U.S. Marine SOF prepare for role in Combined Resolve II, CC BY 2.0