Although Richard Davalos' character is listed as Lt. Wansee in the episode credits, he wears the hauptsturmführer rank on his uniform, which is the SS equivalent of captain. Dietrich also correctly addresses him as both Captain and Hauptsturmführer.
Cpt. Dietrich: Captain Wansee, as a member of the SS, you are supposed to have a sense of honor. As you recall, we concluded the bargain.
Cpt. Wansee (shaking and pounding fist): It is...fair...in war. It is all...fair in war! It is all fair!
Although no Waffen-SS combat units served in the North Africa campaigns, a SS Security Police unit was created under the command of SS Obersturmbannführer Walther Rauff in July, 1942. The unit set up a network of labor camps in Tunisia and was empowered to "take executive measures against the civilian population."