A Walk Around Photo Series of a Beechcraft Model 18, or the Twin Beech as it was known saw military service in a number of versions. This is the USN SNB-5 Expeditor version, used mainly for training, personnel and cargo transport. The Photos were taken at the MAPS museum in Ohio. This aircraft was built in 1943.
This is partial text from the full article (usually with photos) at https://aeroscale.net/list/snb-5-expeditor-walk-around