This image is of the main hospital building for the Brooke Army Medical Center as it existed in the 1960s. In addition to this, there were other buildings added for treatment and patient housing when this building became too small or had inadequate facilities for modern treatment.
The description states:
BROOKE ARMY HOSPITAL
Brooke Army Medical Center
Fort Sam Houston
San Antonio, Texas
–This older building was replaced in 1997 with a larger, more modern facility on the grounds of Fort Sam Houston where more treatment modalities could be concentrated in a single structure. The older building is now on the Register of Historic Places and is occupied by elements of U.S. Army South.
This image dates from the 1960s.