You mean without chakra enhancements and just purely by physical strength than of course rock lee is at the top. Since these guys are ninjas there fairly physically fit and also learn some martial arts, but without chakra there really nothing specially and could probably get wiped out by more technologically advanced nations.
Chakra is everything in naruto, taking away chakra means back to being normal, lee does'nt know how to utilize chakra but his strength and speed still comes from chakra, so no one would even be on part 1 lee level
Your cqc would have to be outstanding and basically all your other ninja skills such as use of ninja tools, battle tactics will have to be on point. Would be interesting though, sometimes I just like fist to fist combat without jutsu's, sm, etc