Despite the query's premise, the Hispanic American Military History Preservation Society is not in Richmond, California. Its headquarters and museum are located in:
Santa Fe, New Mexico
(Exact address typically listed as 1100 Paseo de Peralta or similar historic district location; verify via current directory.)
Richmond has a rich WWII home-front history (Kaiser Shipyards, Rosie the Riveter) and a diverse Latino community, but no major Hispanic military history institution. The user may be confusing it with the Rosie the Riveter/WWII Home Front National Historical Park (Richmond) or the Mexican American Museum (planned, LA).
For research/visits: Contact the society via the New Mexico History Museum or National Hispanic Cultural Center (Albuquerque) for current location/hours.