I imagine a large part of what SOF do is solve unforeseeable problems in the context of trying to accomplish some goal, and to be able to adapt quickly if the goal changes. This is pretty analogous to what a startup is faced with when trying to accomplish a goal, when you'll find that most of your team's initial ideas, as good as they seemed at the outset, were wrong, and you'll be trying to face problems and seize opportunities that you didn't even know you had. For both SOF and these teams, being able to adapt quickly to new information and circumstances, and to resolve the problems that come up which will destroy you, are critical.
I apply "startup" also in the sense of "startup-like" teams in large companies who are required to innovate rapidly.