On December 31, 2012, NFL.com reported that Armstrong was expected to be interviewed by the Chicago Bears for the head coaching position after Lovie Smith's firing.[1] He also met with the Philadelphia Eagles about possibly replacing Andy Reid.[2]
In the 2016 season, Armstrong and the Falcons reached Super Bowl LI, where they faced the New England Patriots. In the Super Bowl, the Falcons fell in a 34–28 overtime defeat.[3]
On January 9, 2019, Armstrong agreed to become special teams coordinator of the Tampa Bay Buccaneers, rejoining the staff of Bruce Arians who was the head coach of the Temple Owls when Armstrong began his coaching career. Armstrong earned his first Super Bowl title when the Buccaneers won Super Bowl LV.[4]