Editing United States Football League (section)

==Rule changes==
The USFL, compared to other professional leagues of the late 20th and 21st centuries, did not radically change the rules of the game; its rules largely resembled a hybrid of the NFL and [[college football]] rulebooks. The league's rule on stopping the clock was one example of this hybrid approach: outside the [[two-minute warning]], the clock ran between plays after a first down like in the NFL, while after the warning, it stopped between the end of the play that earned a first down and the placement of the ball back into play (to allow the [[chain crew]] to get into place), as is done in college football. Like college football, it recognized the [[two-point conversion]] (that was, at that time, only recognized in the CFL at the professional level) that would not be put into NFL rules until {{NFL year|1994}}. Unlike other American professional football leagues (but like the NCAA then and the CFL), the USFL allowed the usage of a small, plastic "tee" for extra point and field goal attempts.<ref>{{cite web |url=https://www.nytimes.com/1983/08/14/sports/theres-no-margin-for-error-for-pro-kickers.html |title=There's No Margin For Error For Pro Kickers |last=Lusteg |first=Booth |date=August 14, 1983 |website=The New York Times |access-date=November 1, 2021 |quote=In the N.F.L., unlike college and the U.S.F.L., no tee is allowed on field goals. |archive-date=November 1, 2021 |archive-url=https://web.archive.org/web/20211101190229/https://www.nytimes.com/1983/08/14/sports/theres-no-margin-for-error-for-pro-kickers.html |url-status=live }}</ref>

For its final season in 1985, the USFL used a method of challenging officials' rulings on the field via [[Replay review in gridiron football|instant replay]], using a system that is almost identical to that used by the NFL today; the NFL would adopt its first instant replay system (but in a different form from its current one instituted in 1999) in 1986; it would be used until 1991.