Cryptonym: GRATLAS

https://www.archives.gov/files/iwg/declassified-records/rg-263-cia-records/second-release-lexicon.pdf

CIA document: Research Aid: Cryptonyms and Terms in Declassified CIA Files Nazi War Crimes and Japanese Imperial Government Records Disclosure Acts: Page 29: ..."Term: GRATLAS. Definition: Vienna Operations Base in Stiftsdaserne..."

104-10169-10349: MVD RESIDENTURA IN VIENNA AS OF FEBRUARY 1954.

05/03/54: Dispatch from Chief of Base, Vienna to Chief, EE (Attn: Sylvan A. Hobson): Subject: General - Operational/GRINDULGE. Specific - Organization, personnel and facilities of MVD Vienna: Distribution...1 - Gratlas.

104-10169-10343: DISPATCH-TRANSMITTAL OF CLANDESTINE PHOTOGRAPHS TAKEN DURING MAY 1955.

08/18/55: Dispatch from Chief of Base, Vienna to Chief, EE (Attn: Silvan A. Hobson): Subject: General - Operational/GREPIC. Specific - Transmittal of GRATONIC-1 Clandestine Photographs Taken During May 1955: "1. Transmittal herewith are 407 clandestine photographs taken by GRATONIC-1 during the month of May 1955. All of them were taken with the 'chest camera' described in the reference and previous correspondence. The numbering system is the same as and a direct continuation of that used for the initial GRATONIC-1 photographs transmitted with the reference...At the present time, GRATONIC-1 coverage of sensitive areas is being temporarily suspended, both in order to avoid burning him through overuse and because the VCB Technical Support Section, in the midst of its move from GRATLAS to GRBAIL, is not able to process photographs..."