Responsibilities:

Enforce rules, assess penalties, signal the start and end of games, stop play for reviews as needed and inspect sports equipment prior to the start of games.

GRASSROOTS REFEREE (FORMERLY GRADES 9, 8, AND 7)

A referee’s journey begins at the Grassroots level. U.S. Soccer Grassroots Referees are qualified to officiate competitive, small-sided, or recreational youth matches and amateur adult matches.

Link: 

https://www.ussoccer.com/referee-program