Ruppelt was the director of Project Grudge from late 1951 until it became Project Blue Book in March 1952; he remained with Blue Book until late 1953.
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Incidentally, the base had also headquartered two formal unidentified flying object investigations: Project Sign (1947–1948), which had come to favor the extraterrestrial hypothesis before being replaced with Project Grudge (1949–1951), which had a debunking mandate.
Project Grudge, a project by the U.S. Air Force to investigate unidentified flying objects (UFOs)
On September 10, 1951, there was a radar/visual UFO encounter near Fort Monmouth in New Jersey.
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though he was initially scheduled to stay with Blue Book for only a few months, when Project Grudge was upgraded in status in late 1951 and renamed Project Blue Book, Ruppelt (then a Captain) was kept on as director when normally, such an upgrade would require the appointment of at least a Colonel to oversee the project; this may well be a testament to Ruppelt's leadership and organizational skills.