Yup--FWIW, 'FG' should be Freiberg in Saxony.It's an export plate for a PCSing service member, DOD civilian or contractor coming out of Germany.
For OPSEC reasons they get normal German format plates while stationed there. So if they're in Kaiserslautern it's KL, Wiesbaden is WI; Spangdahlem is SP, etc. Embassy and consulate staff get special German plates, either diplomatic or official depending on their position. They're formatted differently.