19 officers are in hangar at Ross Field in Arcadia as part of their training as Reserve Officers Balloon Personnel. J.H. Hoeppel in white shirt is on the right (kneeling). Lt.C.P. Kane, was in charge of the class. He is 4th man from left (next to balloon) in second row.
Roy Knabenshue, who built observation balloons for the U.S. during WWI, displays a model at Ross Field. Roy Knabenshue on left, C.P. Kane, commanding officer, on right.