AIR MATERIEL COMMAND
3160 Electronics Station
Cambridge Field Station
230 Albany Street
Cambridge 39, Mass.
ACT/Be
April 18, 1949
000.92
In reply address
both communication
and envelope to the
Commanding Officer
and attention of
following office
symbol. ERH
SUBJECT: Analysis of Project "Grudge" Reported Incidents
TO: Commanding General
Air Materiel Command
Wright-Patterson Air Force Base
Dayton, Ohio
ATTN: MCIAKO
1. Reference is made to the letters from your Headquarters to
this station of 22 November 1948, 6 December 1948, and 14 January 1949,
Subjects: "Project 'Sign'", requesting that reported incidents 1
through 172 be analyzed to determine whether or not these might have
been caused by balloons launched by these laboratories.
2. A listing has been compiled of all balloons launched by these
laboratories and its contractors for special atmospheric research pur-
poses, from the first such launching to No. 101 on 17 November 1948.
Each of these launchings has been compared with the reported incidents
1 through 172. Factors of comparison were date of launching and date
of recovery with respect to date of reported incidents; place of launch-
ing and place of recovery with respect to the place of reported in-
cidents, and possible deviations from the known flight path with respect
to the place of reported incidents. So that your office may make an
independent analysis, three copies of the launching list are inclosed.
a. Incidents No. 5 through No. 16 reported on 4 July 1947
throughout Oregon, Idaho and Washington gave, in general, descriptions
of clusters or groups of objects. The 3 July 1947 balloon launching
No. 8 at Alamogordo was a cluster of balloons and was not recovered,
and so might be suspected of being the cause of these reports. However,
although not recovered, this flight was terminated in the New Mexico
Tularosa Valley only a few miles northwest of Alamogordo. That the
balloons were downed was determined both by airplane spotting and by
radio direction finding upon the balloon telemetering instruments.
Recovery of the balloons and instruments was prevented by the im-
passability of the terrain.
b. Balloon release No. 11 of 7 July 1947 could compare
with respect to date with incident No. 1 through No. 4, and again
with incident No. 40. This balloon flight was again a cluster.
Note: The document contains a blacked-out region near the bottom right, which is represented as [redacted] in the transcription. The text is transcribed exactly as it appears, including spacing, line breaks, and punctuation. The header and footer information are preserved as they appear in the image. The document is a typewritten memo from the Air Materiel Command to the Commanding General, discussing the analysis of reported incidents related to Project "Grudge" and their potential connection to balloon launches. The memo references specific dates and incidents, and provides details about balloon launches and their recovery or termination. The text is presented in a formal, military-style format, with clear headings and numbered paragraphs. The document is dated April 18, 1949, and is addressed to the Commanding General of the Air Materiel Command at Wright-Patterson Air Force Base, Dayton, Ohio. The subject line indicates that the memo is about the analysis of Project "Grudge" reported incidents. The memo references previous correspondence from the recipient's headquarters and requests an analysis of the incidents to determine if they were caused by balloons launched by the laboratories. The memo also mentions that a listing of all balloons launched by the laboratories and their contractors has been compiled and compared with the reported incidents. The memo provides specific details about certain incidents and balloon launches, including their locations, dates, and outcomes. The document is presented in a clear, readable format, with no additional commentary or interpretation. The transcription is intended to be as accurate as possible, preserving the original wording, spelling, numbers, and line structure of the document.