Just throwing this out here. I mean... I can understand the name for the most part; why it's called "Sigma Six". It just sounds cool. XD And, of course, all because of the Sigma suits. But... .... SOMEONE couldn't count! XD
It's Duke, Scarlett, Snake Eyes, Hi-Tech, Tunnel Rat, Heavy Duty, Spirit, and Long Range.
Unless we're not counting Spirit, who I don't think showed up in either of the openings... or the oft-forgotten Long Range... (and I don't think we bother about the 'junior Joes' Jinx and Kamakura c.c) in the "original Sigma Six". Which is what I guess the case is. ^.^;
But... as Spirit and Long Range ARE Joes, well... @_x; Guess they just don't fret too much over numbers. ^^; And "Sigma Six" sounds cooler than "Epsilon Eight" XD *lol*