The conclusion of The Day after Roswell, Col. Philip J. Corso's account of what happened at Roswell, and it's aftermath and the part he played in the events...

...Over the next couple of weeks in January 1943, after a flurry of diplomatic activity between the Yugoslavian embassy and J. Edgar Hoover’s office, the FBI turned the entire matter over to the Office of Alien Property, which also wanted to get out from under the diplomatic tug of war between Belgrade and the State Department. The OAP, still reacting to the vice president’s instructions that papers that could give aid to the enemy could not leave the country, contacted the chairman of what would become the Office of R&D, the National Defense Research Committee of the Office of Scientific Research and Development, Dr. John Trump. Dr. Trump examined the papers, determined that not much of them were useful, but decided to make photocopies of a number of papers Tesla wrote during the years preceding his death.

Trump also wrote abstracts of those papers, which included an undated monograph by Nikola Tesla entitled “New Art of Projecting Concentrated Non-Dispersive Energy through Natural Media, “ Tesla’s description of how he would generate and direct a high energy beam of electrons at a target. Though dismissed by Trump as unworkable, the paper nevertheless described Tesla’s latest thinking about a directed energy weapon, the accelerated particle beam device. With the OAP’s making photographs and abstracts of Tesla’s papers, the entire Tesla property remained in storage until it was sent back to Belgrade in the 1950s. That should have put an end to the matter. However, in 1945, just after the war ended, the Air Technical Service Command at Wright Field outside of Dayton, Ohio, sought copies of the Tesla papers from the Office of Alien Property in Washington and sent a military courier to take possession of them and bring them back to Wright. Although there was some correspondence between the OAP and the Air Technical Service Command over the next two years regarding the disposition of the papers, at least one of Gen. Nathan Twining’s officers at the Air Materiel Command contacted the Office of Alien Property in November 1947 to tell them that the AMC at Wright Field had possession of the Tesla papers and would maintain possession of them at least until after January 1, 1948. Thereafter, the papers, including Tesla’s own monograph on his accelerated particle beam weapon, seem to have completely disappeared - until they appeared in my OCRD files in 1961. But that was only one of the copies....

https://exploringrealhistory.blogspot.com/2020/12/part-5-of-5-day-after-roswellteslas.html