Where can i find information on U.S. Army's WWII-era-1944 neuropsychiatry reconditioning programs for returning veterans?

The Follow Up, was most likely through the VA. Veterans serving in battles such as Iwo Jima and D-Day, and prisoner of war survivors were often given the diagnosis of Combat Neurosis. The term PTSD was most likely not utilized during that era. The VA also had controlled animal research facilities and Psychiatric Wards and Hospitals. 

Walter Reed and Bathesda Naval Hospital most likely were overwhelmed with casualties, injuries and rehabilitation service. Soldiers with Tropical diseases such as malaria, typhoid or dysentary  were basically discharged and sent home, per my uncle who was in Burma. The Yellow Fever vaccine, was modified  in 1942 as to remove the serum which was contaminated with hepatitis. And unfortunately, in some extreme cases where men were diagnosed as psychotic and a danger to society. They may have been committed to various prisons or secure psychiatric facilities. You may have to review the VA studies.

Another resource could be the Office of the Surgeon General.

Also, consider the time frame and terminology of "MAXIMUM Benefit". Some soldiers became psychotic and were a danger to others and themselves. Some were placed in confinement. In some cases electro shock therapy and lobotomies were performed. If the soldiers were still the property of the government,  then procedures could be performed without consent.  It was a somewhat different era, with vastly different methods of perceived "beneficial" treatments.

Lobotomy For World War II Veterans: Psychiatric Care by U.S. Government - WSJ.com

You may also find someone who worked in a military psychiatric ward or VA psychiatric hospital after WW2 who could

describe the conditions and various therapies. I have spoken to healthcare workers who worked after the Korean War and during the Vietnam War, and could not discuss the events relayed, in this forum.

Dear Mr. Russell,

Thank you for posting your question to the History Hub.

A quick search of the National Archives Catalog reveals several series which may contain information relevant to your research. One example is the series Army Medical Laboratory Reports and Project Files Relating to Contracts, 1948-1956 from the Records of the Office of the Surgeon General (Army) (Record Group 112), and another example from RG 112 is the series Unit Annual Reports, 1940-1949. Other examples include the series Supporting Documents for the Volume "Neuropsychiatry in WWII Volume I: Zone of the Interior" and Supporting Documents to the Volume "Neuropsychiatry in WWII, Volume II: Overseas Theater" from the Records of the Army Staff (RG 319). You can contact the Textual Reference Branch at the National Archives in College Park, MD (Archives II) with questions about these records. Their email address is archives2reference@nara.gov. Please search the Catalog for further potentially useful records.

The Motion Pictures and Sound Recordings Branch at Archives II has custody of the documentary itself, and they may also be able to offer further assistance. Their email address is mopix@nara.gov.

Finally, this press release about the restoration of the film may also be of interest to you.

Thank you, again, for sharing your question with us, and best of luck with your ongoing research.