Personal
- Parents are Robert Armstrong and Naomi Rodriguez-Cornelius
- Has two brothers and one sister
- His brother Josh was a four-year starter at Sacramento State
Before BYU
- Appeared in eight games at Riverside City College
- Had 19 total tackesl (13 solo), five pass break-ups, one fumble recovery and three interceptions
- His three interceptions were all in one game
- Was named to the Dean's list after one semester
- Prepped at Redlands East Valley High School
- Led his team to a CA DII state championship
- As a senior, had 58 tackles (40 solo), seven pass deflections, two fumble recoveries, one blocked field goal and 13 interceptions
- Broke the school single season and career records for interceptions
- His 13 interceptions also broke the Inland Southern California record for interceptions in a single season
- Selected as the 2014 All-Area Defensive Player of the Year and to the 2014 Division II First Team
- Named to the honor roll twice during high school
- Received offers from Sacramento State, Utah State, Fresno State and UC Davis