completed, and the military police went to their shelters and
stations. A final check of personnel was made in each shelter (3; 9;
12).

At the time of detonation, 99 project personnel were in the three
shelters: 29 in the north shelter, 37 in the west shelter, and 33 in
the south shelter. Dr. Oppenheimer, Dr. Bainbridge, and other key
personnel awaited the firing at the south shelter, which served as the
Control Point. Figure 2-3 shows the exterior of the south shelter;
figure 2-4 gives an interior view of one of the shelters, most likely
the south. Although most of the shelter occupants were civilians, at
least 23 military participants were spread among the three shelters
(1; 12).

The remainder of the test site personnel were positioned at the Base
Camp 16 kilometers south-southwest of ground zero, or on Compania
Hill, or at the guard posts. Important Government officials, such as
General Groves and Dr. Vannevar Bush, Director of the U.S. Office of
Scientific Research and Development, viewed the detonation from a
trench at the Base Camp. The Base Camp is depicted in figure 2-5.

The military police of Guard Posts 1 and 2 were instructed to be in
foxholes approximately five kilometers west and north, respectively,
from their posts. The military police of Guard Posts 3 and 4 were
instructed to be in foxholes south of Mockingbird Gap. A radiological
safety monitor was assigned to the group from Guard Post 4. Guard Post
5 personnel were to be in the south shelter, Guard Post 6 personnel in
the west shelter, and Guard Post 7 personnel in the north shelter.
The military police of Guard Post 8 remained at that post, 400 meters
east of the Base Camp (9).