Was the head of the FBI refused access to the disc recovered at Roswell?

In the summer of 1947, numerous UFOs were spotted by local authorities, airline pilots and civilians world wide. By July these sightings made headlines in newspapers all across the United States, culminating on the 8th of July with the alleged recovery of a crashed disk on a ranch near Roswell New Mexico. J. Edgar Hoover, the head of the FBI, was urged to investigate these matters.
The memo states: I would do it but before agreeing to it we must insist upon full access to discs recovered. For instance in the La. case the Army grabbed it & wouldn't let us have it for cursory examination.

The above memo, handwritten by J. Edgar Hoover in mid-July of 1947, can be found on the FBI's own website at: http://foia.fbi.gov/ufo/ufo1.pdf (see page 45 of 69, also page 38).

John Edgar Hoover was appointed Director of the Federal Bureau of Investigation on May 10, 1924. He ran the FBI until his death on May 2, 1972.