In 1924, Base Borden became the largest air station in Canada. During the 1930s, Borden was made a permanent Army training base. Signals, armour, infantry, service corps, medical, dental, provost, intelligence, and nuclear, biological and chemical schools were all established in the years that followed. MGI Construction built and expanded an overflow parking area on the base, including grading, asphalt paving, and line painting. Overflow parking provides additional space in which to leave vehicles if the main car parking is full.