Sometimes I visit eBay to see what Jeep items folks out there are putting up for sale. This gem came up from someone in the Toledo area. It's the original artwork used for the Willys MB Water Fording Kit. Thankfully the shots were of decent quality as I was able to clean up the image and fill in the frayed edges and soiling.
An unmodified Willys MB was able to water ford about 21 inches of water before the transfer case vents and fuel pump have issues. Troops in the field were modifying their Jeep 4x4s to survive deep water in their beach landings. This included sealing the distributor and ignition system, and adding an intake snorkel and extending the exhaust system among other things. Willys-Overland engineers were tasked with coming up with a kit to distribute to the troops.
This is just one example of the many ways the Willys MB Jeep 4x4 was modified for use in the field during World War II.