US Chess rule 16A states:
“16A. Allowable time controls.
The US Chess office maintains a list, available on request, directly from the US Chess office or at www.uschess.org, of the currently allowable time limits for different types of tournaments. See also 5C, Ratable time controls.”
Why on earth would someone need to request a list of allowable time controls from the US Chess office? The time control rules are clearly spelled out in rule 5C.