reply to post by NGC2736
I did a search on the readable parts of the
PDF page 2 and came up with 2 sites:
PROJECT TWINKLE

During February 1950, the frequent reports of unexplained aerial phenomena in the vicinity of Holloman Air Force Base and Vaughn, New Mexico
prompted the Commanding Officer of Holloman Air Force Base to initiate a program to gather factual data……..
(bottom part of the letter) =
Within the next few months, Dr. Whipple will have completed the installation of two 18-inch Schmidt cameras for meteor studies. The cameras will be
stationed about 20 miles apart in the vicinity of Las Cruces, New Mexico. Since these studies will be sponsored by the GRD, arrangements can be made
for examining the film for evidence of aerial object phenomena
Also check out :
UFO Casebook

During February 1950, the frequent reports of unexplained aerial phenomena in the vicinity of Holloman Air Force Base and Vaughn, New Mexico
prompted the Commanding Officer of Holloman Air Force Base to initiate a program to gather factual data.