In the US, most in the coaching ranks are familiar with the USSF standard ratings, E, D (state and national), C, B, and A licenses. Typically, you won't see a D1 school being coached by someone with anything less than an A license. I say typically, because there are some with a B.
For the B license, typically you need either 1+yrs with a C License from the USSF, the Advanced National Diploma from the NSCAA or five years of coaching experience (any level) AND five years of playing experience with a Senior National Team or five years of FIFA recognized professional playing experience. There are a handful of ex USMNT players with these licenses as well.
For the A license, you have to have your B for 1-3 years and be at least 21yo.
The C-A licensing are all 7-9 day residential courses with analysis and testing throughout. From the level D to A, there is testing on a pass/fail (C-A has 5-1 rankings with 5 being a fail and 1 a pass, if you fail one, you can retake that section before the residency is over, but fail again and you're out till 1 year hence).
Basically, just to get to your A license, you have to