What would any '70s toy line be without a martial arts set? Karate (7372) gave Joe red, brown, and black belts, along with a practice mat, uniform and break-away brick to practice his power chop. There is a hard to find version of this set with a tan fabric suit rather than white, though it may be initially hard to tell apart from a merely dirty white set. See images of this variation below.
Below, the tan version of the Karate set in the window box, a rare find shared courtesy of Joezeta.