Hacker15e
Who am I? Where are my pants?
That seems like a really high AOA for the wing on that airplane, yikes.
Thin, delta-shaped wings need AOA to produce lift at lower speeds. The MiG-21 has an AOA gauge, and although I've never flown one, the guys I know who have use the AOA gauge for performance in lieu of airspeed (like many other fighter aircraft do).
Fighters can also operate at very high AOAs relatively easily. As I've said before, in the T-38 I could have the airplane at a full stall AOA and still maneuver the airplane to Commercial PTS standards of airspeed, altitude, and heading.