I'm doing specialized research on female combatants during World War II. The answer is, kind of true. Warning: this reading is not for the faint of heart. References to violence, sexual violence, and the many atrocities carried out during the Holocaust.

Ilse, She Wolf of the SS, is an exploitation film. It's not a true story, but the character is based on two real women: Ilse Koch and Irma Grese.

Ilse Koch was the wife of the commandant at Buchenwald; she and her husband were arrested by the Nazis and charged with embezzlement and murdering prisoners to cover it up. She was acquitted; her husband was executed by the Nazis in the spring of 1945. In 1947, she was tried at Nuremberg, accused along with 30 others of aiding and abetting the murders of inmates at Buchenwald. She was widely rumored to have selected inmates with tattoos so that their tattooed skin could be preserved. It was also said that she owned lampshades made of human skin, from the murdered prisoners. These allegations were never proved and the prosecutor said there was no physical evidence, although in a later trial witnesses said she had selected tattooed prisoners and that she had participated in making lampshades from human skin. She was tried a couple of times and was in and out of prison for years. Two of her sons killed themselves because they were ashamed of their parents. Her third son was born while she was in prison but her identity was kept secret from him until he was 19 years old, whereupon he visited her in prison. She killed herself in 1967 in her prison cell; she had been having delusions and was afraid concentration camp survivors were going to find and abuse her in her cell.

Irma Grese was an SS guard over women imprisoned at Ravensbruck, Auschwitz, and Bergen-Belsen. Irma had been brought up in the Hitler Youth's girls' division, the Bund Deutscher Madel. She was a poor student and left school at the age of 14, after which she tried and failed to be appointed as a nurse trainee. Out of options, she decided to be a concentration camp guard and entered the trainee program when she was 18, in 1941. When she went on active duty, her supervisors admired her obedience and brutality toward the prisoners, and she started moving up the ranks of the SS.

She was also noted for being pretty amoral. She slept with male guards and also raped female concentration camp prisoners, generally having another inmate stand watch for her. She was often violent with prisoners, personally carrying out beatings and various sadistic punishments such as forcing them to hold heavy rocks above their heads for hours at a time. She was known for carrying a whip and using it whenever the mood struck her. She also helped carry out the selection (choosing who would live and who would die) at Bergen-Belsen, sometimes helped by her half-starved German Shepherds which she used to savage the prisoners. She was tried at Nuremberg with 45 other SS officers at the "Belsen" trial and hanged at the age of 22.

If you aren't exhausted yet...both of these women were associated with concentration camps, not POW camps. POW camps were for male soldiers and fell under the jurisdiction of the Wehrmacht. Women who served in the Wehrmacht were generally secretaries, nurses, or telephone operators, though sometimes they served as part of anti-aircraft operations. In general, though, German women were expected to be at home having babies.

In terms of being taken prisoner by partisans, the record is less clear. Undoubtedly German military personnel who were captured by the various resistance groups were subject to torture, but this would mostly have been carried out by men. Although some social norms were upended (young women did serve as snipers and couriers), that doesn't seem to have extended to women torturing male prisoners. Of course, you can't prove a negative and it may be that someday evidence of women torturing male prisoners of war will turn up.

So, that's the World War II part of the question. I don't have the background in Vietnam to answer that part.

Edit: telephone operators and nurses aren't the same thing