Casey:
Yes. The MX basing mode was a
question that became almost comical in that the idea was that we tried to show that we looked at
all different basing modes and as a result it seemed like we had this big missile and we were
frantically looking for some place to put it. When in fact none of that was really true. We knew
ways and means of basing it. The issue was, how do you pick the best one. Early on our favorite
was the so-called buried trench or tunnel. It was a hardened tunnel, below ground, shallow,
shallowly buried so that you could run the missile up and down the tunnel and in fact when you
got command to launch the tunnel, the missile trailer would just stop where it was, squat down
and launch out through the top. It had the advantage of being unobtrusive from the outside
surface. The tunnel was buried underground. You could deny knowledge by any outside aggressor as
to where the missile was simply because it moved quietly up and down this tunnel. There were
several other mobile missile modes talked about and studied and projected. Principally I think
it was this tunnel I'm talking about, and then this shelter based system which was a kind of
hardened structures on the surface of the ground, connected either by rails or by road, and then
a series of silos, not quite as hard as what we talked about later in the super hard silo mode,
but rather proliferated so that the location of the missile was denied to any aggressor and
therefore survivable in that sense. Early on we thought that the tunnel was the best because it
was low in terms of manpower. That is, you could move the missile up and down the tunnel,
remotely, electronically, and not have to have people in close proximity to it when you made
these moves. Also it had the advantage of not lifting that 200,000 pound structure every time
you wanted to move from one point to another. The silo was the one that most of the scientists
liked the best because you could make a hardened structure efficiently with this vertical silo
mode. Small occlusion on the surface and we were used to building silos anyway. The thing I
didn't like much about the silo was as you moved it from one to the other in order to play the
game of so-called shell game or concealing the location from any adversary, this SAC cruise
would have had to erect the missile and emplace it or emulate that action at the unoccupied
silos and that seemed to me like a lot of busy work. And also with the heavy loads and it's
somewhat dangerous work to be doing that routinely around the whole array of silos. The surface
based system was really I guess the closest alternative to not having to erect the missile and
yet being able to move it reasonably efficiently between hard points and still be ready for
launch at any time. As I mentioned, we were alleged to have done 30 or 35 different modes. Most
of that was cosmetic, as I said. I think the whole story was overblown, partially I guess our
own fault. We tried to make the point that we looked at so many and yet it became a tag we were
stuck with. "They can't find the right answers," so to speak. But I believe our studies showed
the tunnel to be the first best choice, some of the scientists argued that we'd have exaggerated
weapons effect should a weapon intercept the tunnel. That plus some people didn't believe our
estimates of the cost of building the thing based on their experience with subway systems. But
with those two arguments flailing around, we had several expert boards that looked over our
shoulder, so to speak. And among those, notable were a couple that the Air Force Scientific
Advisory Board did. I think you mentioned earlier Dr. May's study. He led one of the SAB
studies, Scientific Advisory Board studies, which I think at that time, let me see if I got the
sequence right. First we had the tunnel and these questions were raised. We kind of backed away
from that under the influence of a lot of the questioning and said, well, ok, hardened structure
on the surface is a reasonable alternative. Dr. May's group, I think, went all the way to the
vertical silo and ultimately that was not satisfactory to some people in the Carter
Administration. They really wanted the horizontal motion. And so we worked our way back to the
shelter base system. The so-called hardened garage connected at that time by roads. And that was
a system that really was the forefront of the time when we got full-scale vote and go ahead in
1979. In June of '79 we were told to proceed with the missile, and I think it was September of
'79 we finally got the basing mode, full-scale development to start. And that was pursued. It
used a lot of area in both Nevada and Utah, the favorite locations. Because we were looking for
large areas which could accommodate this array. At that time we were using 200 missiles and
4,600 shelters, or a ratio of 23, 23-to-1 I guess that is. That is 23 potential launch potential
launch places, one of those occupied. Therefore the targeting problem was fairly large for any
adversary.