 he was not eligible for differential pay. The FAA cited Adams versus Department of Homeland Security, which saw that reservists are only entitled to differential pay when directly called to service in a contingency operation. You know, I'm glad the US Supreme Court's going to review this case. When reservists gets called to active duty, they really have no say of where they're going to serve. However, the financial impact is the same, whether they're serving stateside or in a foreign country.