Originally designed in the 1930s as patrol/rescue planes, eventually built in 1945 as cargo carriers, converted for water dump firefighting. https://en.wikipedi

Originally designed in the 1930s as patrol/rescue planes, eventually built in 1945 as cargo carriers, converted for water dump firefighting. https://en.wikipedia.org/wiki/Martin_JRM_Mars https://en.wikipedia.org/wiki/Martin_JRM_Mars