I can see it. It kind of reminds me of when I was in college, I found it easier to take my math courses over the Summer terms. I found the condensed intensity to be more conducive to learning things I had a hard time with. Simple fact was when I only went to my college algebra class two or three times a week I found myself not commiting. I could see the same thing, especially since you are talking about people going into it piecemeal. Imagine doing the initial part, taking a few months maybe up to a year later doing the next phase, you basically have to stay in the same level of fitness to complete the course over a two to three year period longer than you did if you did it straight through. It would seem to me to be like maintaining your pre competition fight training over an extended period of time instead of just eight weeks out from a contest. It would wear on you psychologically and physically, add to that you have to do correspondence courses and at home work while maintaining your regular civilian job. I know that a large component of the PJs in the air force are attached to reserve units, I don't know if they do a reserve modified pipeline. in fact the unit that picked up Travis Luttrell was a reserve unit. Speaking of the SAS, don't they have a reserve unit training as well? I know Bear Grylls was a reserve SAS, although I heard they aren't regarded as highly as the "regular army SAS" I don't know if they still have it. The FFL on the other hand, that's a whole different story. I've read some stories about that, some are a little crazy, but from what I've read you can't join the para regiment until your second enlistment and each of their enlistments are five years each. I think the same with their jungle training/unit which is in French Guyana. Heard that was pretty brutal, I was watching one thing about their obstacle course a Marine unit did it and it took them 8 hours to complete, then again the SEALs are not allowed to submit an official team in the eco challenge anymore since the couple years they tried they failed to complete, to rub salt in the wound a team of playboy bunnies ran it the one of the years the SEALs tried and they finished.