Armstrong was a dual-threat quarterback for the Nebraska Cornhuskers but will make the transition to safety with the Vikings. At Nebraska, he posted a 30-14 record as a starter, the third-most wins in Huskers history.
He never completed more than 56 percent of his passes in a season in Nebraska but threw for 3,030 yards and 22 touchdowns in 2015, his most productive passing season.
In 2014, he rushed for 705 yards and six touchdowns. He followed that with 400 yards and seven rushing touchdowns in 2015, and last year he had 512 yards rushing and eight touchdowns. For his career, he averaged 4.3 yards per rush.
He will have a hard time making the Vikings’ 53-man roster with a fairly deep set of safeties, but, with his athleticism and to help with the transition to the defensive side of the ball, he could be a good candidate for the practice squad. The Vikings have had players go from a rookie tryout to making the team in the past, including cornerback/punt returner Marcus Sherels and last year’s leader for receiving yards, Adam Thielen.
To make room for Armstrong on the offseason 90-man roster, the Vikings released WR Mitch Mathews.
Also on Tuesday, the Detroit Lions’ signing of former Vikings RB Matt Asiata became official.