23857122-0457-180273-0396

AIR MATERIEL COMMAND ACT/Bs 3160 Eleotronics Station 000 .92 Cambridge Field Station In reply address | 230 Albany Street April 18, 1919 both communication Cambridge 39, Mass. and envelope to the Commanding Officer and attention of following office symbol. ERH SUBJECT: Analysis of Project "Grudge" Reported Incidents TOs Commanding General Air Materiel Command Wright-Patterson Air Force Base Dayton, Ohio ATTN; MCIAXO 1. Reference is made to the letters from your Headquarters to this station of 22 November 1944S, 6 December 1948, and 14 January 1919, 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 l through 172. Factors of comparison were date of launching and date of recovery with respect to date of reported incidents; place of launoh- 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 muse 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 direotion finding upon the balloon telemetvring instruments. Recovery of the balloons and instruments was prevented by the in- 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 inoident No. 40. This balloon flight was again a cluster. ~ S=34560 Declassification Authority: NND 57565