

Because of his SS membership, he was placed in a Waffen-SS mechanical supply unit, with which he took part in the Battle of France. When Nazi Germany invaded Poland in September 1939, he was drafted into the Wehrmacht. In 1937, he also joined the National Socialist German Workers Party. He was not particularly interested in politics and joined Reiter SS, a branch of Schutzstaffel (SS) that focused on horsemanship and equestrianism, in 1934.

After his father's death in 1928, Weiss took over the family business. From 1923–1927 Weiss lived in South America, helping his brother to establish a farm. He was an apprentice in his father's shop. Weiss followed his father's steps and received education in plumbing and heating installation. He was born to a well-to-do Protestant family in Karlsruhe. He was also the commander of the notorious Nazi-sponsored Ypatingasis būrys killing squad, which was largely responsible for the Ponary massacre where approximately 100,000 people were shot. Martin Weiss (21 February 1903 – 30 September 1984) was a Nazi official and de facto commander of the Vilna Ghetto and a Holocaust perpetrator.
