Mr. DELGADO. That's right. Mr. LIEBELER. And when the radar screen would pick up an aircraft, you would then challenge that aircraft? Mr. DELGADO. Right. Mr. LIEBELER. And it would have to identify itself? Mr. DELGADO. That's true. Mr. LIEBELER. And the code or signals that you sent to the aircraft requesting it to identify itself were classified information? Mr. DELGADO. That's right, along with the range capabilities of the radar sets and their blindspots and so forth and so on. You know, each site has blindspots, and we know the degrees where our blindspots are and who covers us and that information. That's considered secret, what outfit covers us and things like that. Mr. LIEBELER. And what was the latter---- Mr. DELGADO. What outfit covers us, that we can see. And as I say, the capabilities of the radars, as I said before. Mr. LIEBELER. How far out they can reach? Mr. DELGADO. Yes. Mr. LIEBELER. And pick up an aircraft? Mr. DELGADO. Yes; and how high---- Mr. LIEBELER. And how high---- Mr. DELGADO. And how low we can catch them and where we can't catch them. Mr. LIEBELER. And I suppose all the men who worked with the radar sets knew these things? Mr. DELGADO. They all knew. What do they call it now--authentication charts, which is also a secret. Mr. LIEBELER. What is the nature of these charts? Mr. DELGADO. Authorization chart is, if we receive an order over the phone, over the headsets--authentication. Pardon me. That's the word. Let's say this order, we can question it. What it actually amounts to, he has to authenticate it for us. Now, he should have the same table or code in front of him that I have. He gives me a code. I would look it up in my authentication chart, decipher it, and I could tell whether or not this man has the same thing I am using. And this changes from hour to hour, see. There's no chance of it--and day to day, also. Mr. LIEBELER. So that the information, the code itself would not be of any particular value to the enemy, since it is changed? Mr. DELGADO. It's changed from day to day; no. Mr. LIEBELER. Did there come a time when you were stationed at Santa Ana that you met Lee Harvey Oswald? Mr. DELGADO. Yes; in the beginning of 1959. He arrived at our outfit. I didn't take no particular notice of him at the time, but later on we had--we started talking, and we got to know each other quite well. This is all before Christmas, before I took my leave. Mr. LIEBELER. This was in 1957 or 1958? Mr. DELGADO. 1958. And we had basic interests. He liked Spanish, and he talked to me for a while in Spanish or tried to, and since nobody bothered, you know--I was kind of a loner, myself, you know. I didn't associate with too many people. Mr. LIEBELER. How old were you at that time? Mr. DELGADO. I was 17--18 years of age; 17 or 18. Mr. LIEBELER. About the same age as Oswald?