The Fort Monmouth sightings are a well known fact. As I said this report and few more after this were the last to be made for Project Grudge. Here is
an excerpt that deals with Project Grudge and this sighting aswell:

There were a series of UFO sightings near Fort Monmouth, New Jersey in 1951. Pilots and radar operators reported encounters with a number of
fast-moving, highly maneuverable disc-shaped aircraft. A Life Magazine reporter was at Monmouth for some of the sightings, and the case received
significant publicity.
When General Charles P. Cabell asked Project Grudge for their analysis of this UFO encounter, he learned that Grudge had essentially swept UFO reports
under the carpet and was essentially non operational, he became furious. The Fort Monmouth sighting had highlighted Air Material Command's debunking,
and at a meeting, a frustrated Cabell was reported to have said, "I want an open mind; in fact, I order an open mind! Anyone who doesn't keep an
open mind can get our now! ... Why do I have to stir up the action? Anyone can see that we do not have a satisfactory answer to the saucer question."
At another meeting Cabell said, "I've been lied to, and lied to, and lied to. I want it to stop. I want the answer to the saucers and I want a good
answer." Cabell also commented that the 1949 Grudge report was "tripe".
Lt. Col. N.R. Rosegarten wanted Ruppelt to take over as project leader in late 1951, partly because Ruppelt "had a reputation as a good organizer."
While Cabell wanted Project Grudge reactivated, he did not want the general public to know that the military took UFOs seriously, and ordered the
project to keep a low profile. This, he hoped, would protect the military's reputation. If the saucer phenomenon was groundless, they could not be
accused of sensationalism, but if the UFO sightings proved to have some basis in fact, the military could produce serious studies of the subject.
Cabell especially did not want the military to be perceived as “belittling civilians” who had reported the UFO sightings.
www.where-is-area-51.com...
For more info about Project Grudge check the ATS FOIA related link:
FOIA: Project
Grudge