In 1964, MKSEARCH was the name given to the continuation of the MKULTRA program. The MKSEARCH program was divided into two projects dubbed MKOFTEN/CHICKWIT. Funding for MKSEARCH commenced in 1965, and ended in 1971. The project was a joint project between The U.S. Army Chemical Corps and the Central Intelligence Agency's Office of Research and Development to find new offensive-use agents with a focus on incapacitating agents. The purpose of the project was to develop, test, and evaluate capabilities in the covert use of biological, chemical, and radioactive material systems and techniques for producing predictable human behavioral and/or physiological changes in support of highly sensitive operational requirements.
By March 1971 over 26,000 potential agents had been acquired for future screening. The CIA were interested in bird migration patterns for CBW research under MK/ULTRA where, a Subproject 139 designated "Bird Disease Studies" at Penn State.