My flying instructor flew gliders before WWII in Germany. He built and flew them in the Hitler Youth. He told me that the HY in his town just gave the local glider club lots of money but no indoctrination. With the funds the club bought enough material to let the teens build a SG38 and a Grunau Baby from plans. This is what they learned to fly on--the SG-38.
Later he worked for Wolf Hirth as a machinist. And got to know Hana Reich. He flew numerous gliders during that time and borrowed Hirth's Minemoa---all were marked in typical civy registration.
Hirth tried to talk him out of joining the military---but he wouldn't listen. He joined the Luftwaffe with lots of glider experience--but was told by the recruiter "We will make pilots out of butchers and bakers but you think your such a hot pilot--we will put you in the Luftwaffe infantry!" After basic training he came home to visit Wolf Hirth and found him with Hanna Reich and complained about the bad turn of events---when he got back off furlough, he was suprised to find that he had been transferred to flight school. His papers were signed by Hitler.
My instructor said that some of the squadrons kept a Grunau Baby or SG-38 in the back of the hanger for off duty flying. They were clear doped and varnished---marked with WL- (example WL-DBK) WL stood for Wehrmacht Luft. Letters were across the top of the wing like civilian birds.
After the war--1946-48 his local club built a Grunau Baby---This was illegal. They salvaged wood from the Waco troop gliders left out in the fields around his town for material. The club flew it on moonlit nites for slope soaring until it was legal to continue regular glider flying.