There are 647 men in the U.S. POW files that have been coded as "camp" 035 which shows up as:
Dulag Luft
Grosstychow
Dulag 12
https://aad.archives.gov/aad/display...0&cl_11673=035
I think the army had problems trying to code the series of camps a POW might have been moved to. They used a single 3 digit number but had to come up with a different number for each of the possible combinations of camps a man could have moved through. I think code 035 was suppose to show the 3 camps some men went through, first Dulag Luft, then Stalag Luft IV (at Gross Tychow) and then a 3rd camp some men went to after Stalag Luft IV was evacuated in February, 1945. I don't think there was a "Dulag 12", but maybe they went to one of the camps near Fallingbostal (Stalag XIB or Stalag XID)
I believe it possible that "Dulag 12" only shows up as the "third" camp for these 647 men, no other POWs will have "Dulag12" listed as one of their camps.
The old Stalag Luft 4 site no longer seems to be maintained:
http://www.stalagluft4.org/#
but it looks like some of the places the men were evacuated to included Barth, Nuremberg, Fallingbostel and Alton Grabow.