Resistance by the Coolidge administration to implementation of the plan for economic reasons, followed by the onset of the Great Depression severely limited the expansion. The 1st Group experienced restriction on its training operations and curtailment of personnel salaries. Officers were detached for duty with the Civilian Conservation Corps at varied intervals. However the Air Corps was able to expand from 6 to 14 groups in its first decade of existence, half of which were new pursuit groups. The 1st Pursuit Group trained individual squadrons at Selfridge and provided experienced cadres to the formation of these groups.