S Marks The Spot
Article from WW2 Army Motors
Army Jill sitting on the hood of the 1942 Ford GPW
WW2 Jill sitting on the hood of the 1942 Ford GPW.
An “S” should be present on the cowl or after the registration number on World War Two jeeps. It went on the jeeps that passed the radio interference test whether or not they had a radio. AR 850-5, Change 9, dated 27 Jan 1944, a regulation that required an “S” marked on vehicles. This same change also stated an “S” marked vehicle was to be preferred over a non-S marked vehicle when installing a radio. Common sense? Well, sometimes the Army had to spell it out.
‘S’ symbol on cowl of a 1942 Ford GPW and Army Jill sitting at the wheel.

S symbol on cowl of 42 Ford GPW and Army Jill sitting at the wheelWW2 Jill sitting in the 1942 Ford GPW with an “S” mark on the cowl.The “S” designation was also used on USN jeeps as well.Close up of jeep, marking and registration number
Close up of USN jeep markings and registration number
Now in my estimation this is the most interesting part of the photograph. This is clearly marked as a US Navy vehicle.


Also note, the “S” to the left on the cowl. This is blue drab! The “S” was used to designate vehicles that had been tested and passed for radio suppression. This was equipment/parts added to the vehicle to help keep it from interfering with radios by eliminating static. You can also spot what may be blue drab to the right of the registration number. Also note the dark area immediately next to the USN and registration number.