So thats the artillery museum at Fort Sill in Oklahoma, and the monument is actually Geronimo's grave at the Indian POW cemetery. Looks like the "Skull and Bones" society of Yale university apparently dug him up and stole some of Geronimo's skeletal remains, including Prescott Bush.
Overall, looks like a very neat museum to visit, though some of the photos of the museum showpieces, while interesting to see in their original "as found" condition, they really need a thorough restoration.