No named system. We didn't even call it 'combatives' back then (79-85), just lethal/non-lethal force. When I was in Okinawa, we trained with Angi Uezu, but it wasn't Isshinryu exactly. More like excerpts from the Bubishi. Before I was sent overseas, it was grappling style takedowns, boxing, joint manipulation, PR-24 Prosecuter training, mace and handcuff techniques, firearm training with the Colt 1911A1 using a variety of shoot/don't shoot threats and various grips, breaks, and holds (weak hand, upside down, weapon 'slippery' to simulate blood, etc). I learned a lot of what would be called 'come along' holds and what my later Isshinryu training calls Tuite from the so-called "Secret Scrolls of Kumite." Oh, also chokes of various kinds. I still remember the first time I got choked out in training and did the chicken.