Dale Newton's AF-2S amid the clouds over Northern California in 1974. The “SK” on the fin stands for "sub-killer."

The AF-2S over Crater Lake, in Crater Lake National Park, Oregon, 1974. Note the auxiliary fins on the tailplane.

AF-2S N3144G as “Red 30” on the ramp at Redding, California.

White smoke from the left cowl begins to streak the canopy with oil, hampering the pilot's vision.

A general view of the spacious cockpit and its instruments. The Guardian was the largest single-engine piston aircraft to enter production.

Derelict Guardians slowly succumb to the weeds at Chico, California, their service with the Aero Union Corporation at an end.