After biological weapons development was discontinued by President Richard Nixon in 1969, and the bioweapons were decommissioned in 1971–72, he continued to work at Fort Detrick on biowarfare defense projects until 1986.
Products were developed with those desired or required biological, physical, aerobiological, and storage characteristics for employment in specific prototype munitions.
Patrick joined the new U.S. Army Medical Research Institute of Infectious Diseases (USAMRIID) in 1972 and served as its Plans and Programs Officer until 1984, reporting directly to the commander.
On the UNSCOM 78 trip to Iraq (1994), his observations on how process equipment was being used at the Al Hakum facility provided the nearest thing to a "smoking gun" for Iraqi intent until they themselves declared an extensive BW program in 1995.
He then continued to present lectures on the History of Biological Warfare; Bio-Agents; Munition Weaponization; Aerosol Technology; Agent Modeling; Biosafety; Biodefense; and BW Terrorism.
[2] Patrick held five U.S. patents pertaining to biological processes and equipment, and authored 16 articles in scientific journals, as well as 98 in-house Department of the Army publications.