 Lahm was advanced to brigadier general on July 17, 1926, for a four-year tour as an assistant chief, to be commander of the new Air Corps Training Center, established at San Antonio, Texas, on August 16, 1926.Command of the training center included the coordination and management of training at the Air Corps Primary Flying School at Brooks Field, the Advanced Flying School at Kelly Field, and the School of Aviation Medicine at Brooks.Almost immediately Lahm understood that because of the small size of his bases, their deteriorated condition (originally built as temporary in World War I), and the encroachment of San Antonio, his charge to ""coordinate the training in the schools with a view of bringing them as close together as possible, and particularly with a view to making the transition easier for the students going from one school to the other"" required expansion of the center by construction of a new facility.