FAA Private Pilot (Foreign Based) Certificate

• Foreign Pilot License
• Medical Certificate (German Pilots need an FAA Medical)
• Passport (Photo ID)
• FAA Letter of Authenticity
• Contact FAA FSDO or a Military Competency/Foreign Pilot Examiner (MCFPE) 

http://av-info.faa.gov/DesigneeSearch.asp
​https://www.faa.gov/licenses_certificates/airmen_certification/foreign_license_verification/