This is one of the 24 pages of one of the many formerly secret official documents on this issue. These pages are the minutes of an important conference on the issue held at Los Alamos on February 16, 1949. Representatives of the Army, the FBI, the Air Force and scientists joined together. Dr. La Paz spent two years chasing the green fireballs and explains the issues. Dr. Edward Teller, one of the fathers of the atomic bomb, asks questions.
Conference on AERIAL PHENOMENA
It was impossible to make an estimate of the approximate wave and angstroms without detailed spectroscopic equipment, which he did not possess. So whether the Captain actually cut out the spectrum charts and sent them to him or not, I don't know, but it was considered.
Dr. Bradbury: Well, you're not coming up with any bright ideas for you very fast.
Mr. Newburger: No, but as long as we have the preblem presented to you, maybe by thinking on this, you will come up with an idea! ... Of course, you know our entire connection with this started with Madelyn Garynn Merchant back in 1946! 
Dr. LaPaz: Except for the flying discs, nothing that you could say would cause me greater embarrassment! I have actually had communications from Madelyn myself.
Dr. Teller: Your statement of the absence of sound when this thing has gone apparently overhead at the distance of 10 miles, within earshot of people.
Dr. LaPaz: That seems incomprehensible, doesn'it, Dr. Teller? I'm glad to hear you say that because that has been my feeling from the beginning. and we tried deperatly to get confirming evidence whenever sounds were mentioned. No reports have been obtained.
Dr. Teller: I must say that the admission in which one could get ... typical phenomenon is something in the light of ...
Dr. LaPaz: Kaplan told me he was going to get out one of his old blow pressure tubes and begin experimenting as soon as he returned from the UCLA, to see if he could duplicate in any way the descriptions we have given him.
Dr. Holloway: What sound does a P-2  make when it goes overhead?
Dr. LaPaz: I can tell you what they make when they come down.
Comdr. Mandelkorn: I can tell you what they make when they go overhead at the height of about 1,000 yards. But anything manmande that passes overhead at the height of 8-10 miles, at this speed, could be inaudible.
Dr. LaPaz: You think it could be?
Comdr. Mandelkorn: I think it could be. The only .
Dr. Teller: Even it it went at the speed of 10 miles per seconds?
Cmdr. Mandelkorn: Well,
Dr. Teller: You see, at that time, the ... begins to come up.
Dr. LaPaz: You bet it does.