After his playing career, Brock became a coach in the
Arena Football League (AFL), where he served as the head coach of the
Portland Forest Dragons (1997–1999) and the
Los Angeles Avengers (2000–2001). He also was a color analyst for radio broadcasts of Saints games for several seasons, succeeding
Archie Manning, who resigned position when son
Peyton entered the NFL with the
Indianapolis Colts. On January 29, 2007, he was named the
head coach at
Army after the resignation of
Bobby Ross. During his time as head coach, the Black Knights posted a 6–18 record and lost twice to Navy by a combined score of 72–3. On December 8, 2008, Brock was fired by the USMA on December 12, 2008, after two years as head coach, and six days after the Black Knights completed their 2008 season with a 34–0 loss to archrival Navy. During spring training for the 2008 season, Brock elected to close spring practices to implement his new offense. The offense Brock developed was dubbed "the Brock Bone" by
ESPN commentator
Shaun King. The Brock Bone seems to employ a higher percentage of fullback dives than are ordinarily seen in a triple option offense. Coach Brock has commented, "People think that we're just calling fullback dive, but when that’s what they give you, that’s what they give you." Army ran the Brock Bone during the
2008 NCAA Division I FBS football season and finished the season ranked 110th out of 119 NCAA Division I FBS teams in total offense. ==Broadcasting career==