|Questa voce ha bisogno di essere tradotta.|
Il 20 dicembre 1949, dopo quasi un anno di ostruzionismo, il programma di osservazioni strumentali venne approvato e nacque così il Progetto Twinkle. La prima stazione di osservazione (composta da due ufficiali) fu collocata a Holloman Air Force Base Il 21 Febbraio 1950. Only one other instrument post was ever set up. LaPaz criticized Project Twinkle as inadequate, arguing the green fireballs were worthy of "intensive, systematic investigation". Twinkle did manage to record a few events, but the data collected were said to be incomplete in the final Twinkle report. Besides, it was stated, no funding had been provided for follow-up data analysis. In addition, the fireball activity near the observation posts seemed to virtually disappear, as noted in a report from September: "It may be considered significant that fireballs have ceased abruptly as soon as a systematic watch was set up."
Over the objections of LaPaz and others, the final report on Project Twinkle (see external links) concluded the green lights were probably a natural event, maybe sunspot activity or an unusual concentration of meteors. The report stated, "There has been no indication that even the somewhat strange observations often called 'Green Fireballs' are anything but natural phenomena." Twinkle was discontinued in December 1951.
Despite efforts of the final Twinkle report to downplay the fireballs and other studied UFO phenomena as natural, a follow-up report in February 1952 from the USAF Directorate of Intelligence disagreed:
- "The Scientific Advisory Board Secretariat has suggested that this project not be declassified for a variety of reasons, chief among which is that no scientific explanation for any of the fireballs and other phenomena was revealed by the report and that some reputable scientists still believe that the observed phenomena are man-made."
It was also stated that some of the scientists continued to believe they were Russian spy devices. Besides LaPaz, this included Dr. Anthony Mirarchi, the first director of Project Twinkle.
The following month, another letter from the Directorate of Intelligence to the Research Division of the Directorate of Research and Development again stated that the report should not be publicly released, since no real solution had been provided:
- "It is believed that a release of the information to the public in its present condition would cause undue speculation and give rise to unwarranted fears among the populace such as occurred in previous releases on unidentified flying objects. This results from releases when there has been no real solution."