Six months after qualifying he joined the Czechoslovak Air Force.

After flying school, he joined the Czechoslovak Air Force in the 1930s.

Czechoslovak Air Force operated this type post war under designation K-70.

He was instrumental in raising a Czechoslovak Air Force.

Czechoslovak Air Force operated this type post war.

Czechoslovak Air Force received 20 aircraft in 1949.

It first flew in 1934 and began equipping the Czechoslovak Air Force the following year.

He became the first commanding officer of the Czechoslovak Air Force.

Czechoslovak Air Force received 2 built post war, designated VR-1.

However, even with 33% more power, performance was actually inferior, and the Czechoslovak Air Force was not interested in the type.