The warning sign reads "Partisanen-Gefahr / von Velizh nach Usvyaty / Einzelfahrzeuge halt! / Waffen bereithalten", meaning "Partisan Danger / From Velizh to Usvyaty / Single vehicles stop! / Weapons at the ready".
From my personal collection.
As far as i found out, it is Helmut Hauch.
As a platoon leader in the 10th Company of the 3rd fallschirmjäger Regiment , he fought on the Leningrad Front during the Russian campaign. At the end of 1941, Sassen and his unit were in a defensive position at the Neva bridgehead near Vyborgaskaya. He successfully repelled all Soviet attacks over the course of 33 days.
On November 15, 1941, the Soviets occupied an anti- tank ditch just a few meters in front of the German lines. Sassen then independently decided to launch a counterattack. With only five paratroopers from his squad, he annihilated the Soviet forces in the anti-tank ditch, taking several prisoners. The defeat triggered a series of desertions to the German side the following day and led to the temporary cessation of Soviet attacks in that sector. For this action, Lieutenant Sassen was awarded the Knight's Cross of Iron cross.
He died in 2006.
This photo is possibly from 1944 in France , According to Martin Bamber's book "For Free India" page 409, Sant Singh's Soldbuch shows that his final rank was Oberleutnant, and he also served as a staff officer in the Croatian Volunteer Legion , He was also awarded EK2.