The United States Defense Advanced Research Projects Agency and other organizations have researched exoskeletons for combat for decades, but progress has been limited and the actual utility of such systems in combat is still debated (with no systems known to have reached more than prototype status). In 1986 the LIFESUIT was invented by Monty Reed, a US Army Ranger who had broken his back in a parachute accident. While recovering in the hospital, he read Robert Heinlein's Starship Troopers and from Heinlein's description of Mobile Infantry Power Suits, he designed the LIFESUIT, and wrote letters to the military about his plans for the LIFESUIT. TheyShallWalk.org has been developing Exoskeletons since then. In 2001 LIFESUIT One (LSI) was built. In 2003 LS6 was able to record and play back a