Reassigned to Third Air Force in 1944, becoming a Replacement Training Unit (RTU) for A-36 Apache fighter-dive bomber ground attack aircraft.

The P-61's radar and particular flight characteristics enabled it to find and penetrate the most turbulent regions of a storm, and return crew and instruments intact for detailed study.

[4] Part of their duties involved high-altitude atmospheric sampling and radiation detection work in support of nuclear test monitoring.

Due to the excessive cost of repairing all the aircraft, nine were placed in storage at Davis-Monthan Air Force Base, Arizona, in 1972.

The 58th WRS, the last squadron in the Air Force to use the WB-57F Canberra, was inactivated on July 1, 1974, after placing its planes in storage at Davis-Monthan.