Here's what I believe I know about this: NAVSEC Kimball was travelling to the far east during March of 1952 on official business with Admiral Radford in tow. They were in separate planes on their travel leg between Pearl Harbor and Taiwan. We do not have the exact date of the incident, and I do not believe McDonald was able to get it either. Estimations of the date have to do with guesses associated with when Kimball left Hawaii. Whether that was as early as the 15th or as late as the 20th is not, I believe, currently known.
First Kimball's aircraft was buzzed and later Radford's. Whether it was the same UFO is only a logical surmise.
A couple of weeks later, Kimball was back in the states and speaking to an assembly of air cadets, when he mentioned his plane's encounter and the story made the press. For the rest of the story we must depend on our UFOlogy resources. Don Keyhoe says that he was told about the incident by both Admiral Calvin Bolster (chief of Naval Research) and Secretary Kimball himself. Bolster was a classmate and a friend and this contact is believable. As corroberation, Admiral Delmer Fahrney (ex Navy missile chief) and Art Lundahl both told Jim McDonald essentially the same story. This story is, in brief, that Kimball contacted the Air Force about his case and was given an unsatisfactory run-around. Kimball was angry and ordered Radford to begin a Navy study of UFOs since he was unhappy with the way that the AF was handling it. Therefore, in the late spring of 1952, Radford's orders, through ONI, established what was, apparently, a one-man "desk" charged with collecting information about UFOs. The officer in charge of this desk was Lt. Commander Fred Lowell Thomas [sometimes referred to as "captain"]. This was apparently set up sort of like a "special study" and not overly elaborate. Still, it established Lt. Commander Thomas as a Navy contact point regarding UFOs, and Ruppelt refers to him this way in his book. How long this project persisted is not known. Some have conjectured that since this was unwelcome to the AF, it would not have survived long after Kimball's term as NAVSEC, which would cease at year's end due to change in political administrations. Others would believe Lundahl that he attended the "final session" of the study in the ONR building in 1955.
No one knows what the details of these matters are. Whether there was a brief ONI study lasting only for 1952 (that's certain as far as 1952 is concerned), or whether the study persisted into 1955 when Lundahl attended the last session, or something else, we do not know. I can say this with some degree of surety: Lundahl was not conning or misdirecting McDonald on any of this. At the time, Lundahl was meeting somewhat regularly [as Mac's visits permitted] with him to discuss UFOs as a topic of mutual interest with several other DC heavyweights. There is no evidence of any "conspiracy" in Lundahl's interests and I believe that encouraging that element on the site would be an error.
p.s. There is no reason that an ONI intel presentation cannot be held in the ONR building.