Today in WW II: 18 Nov 1940 Alfred Loomis suggests the electronic air navigation system which was later developed into LORAN [long range navigation system] at MIT.  More 
18 Nov 1941 British Eighth Army offensive in Libya, Operation Crusader.
18 Nov 1943 Intensive RAF Bomber Command attack on Berlin, Germany begins with a 440 plane mission that causes only light damage, killing 131 while RAF loses 9 aircraft and 53 aviators.
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WC-9 WC-18 WC-27 Truck, 1/2 ton, 4x4 Dodge Ambulance (G505)

The Dodge WC-9 and the very similar WC-18 and WC-27, are 1/2 ton Ambulance trucks with slightly different engines and other small differences. All are part of the WC model series G-505, built by Dodge during 1941 or early 1942. The ambulances had a longer 123 in. wheelbase and different suspension from the typical specs for the G505 half-ton trucks.

If you don't have the vehicle dataplate, to differentiate you must know the U.S. Government registration number (Army number on the hood) or the serial number which can be found stamped on the left front frame.

Model Serial Number Range Hood Number Range
WC-9 8644701-8666216 W71077-W71973
W71975-W72249
W72256-73371
WC-18 8676901-8694193 W73372-W74631
W74733-W75027
WC-27 81500001-???
81517509-???
81517694-???
W75400-W77080
W77341-W77840

Data from SNL G-657 Dodge Master Parts List. Other data on the Dodge G505 main page.

WC9 Truck, 1/2 ton, 4x4, Dodge Ambulance (G-505). Hood number W-72721 confirms  WC-9  (1941 contract).  Photo dated 15 May 1941.
WC9 Truck, 1/2 ton, 4x4, Dodge Ambulance (G-505). Hood number W-72721 confirms WC-9 (1941 contract). Photo dated 15 May 1941.

WC27 Truck, 1/2 ton, 4x4, Dodge Ambulance (G-505). Hood number W-75620 (and serial number 81510469) confirms  WC-27 (1941 contract, delivered 4-42). Located at the Historic Aircraft Restoration Project (HARP) hangar, Floyd Bennett Field, Brooklyn, NY. Photo courtesy of Phil Gilson
WC27 Truck, 1/2 ton, 4x4, Dodge Ambulance (G-505). Registration number W-75620 (and serial number 81510469) confirms WC-27 (1941 contract, delivered 4-42). Located at the Historic Aircraft Restoration Project (HARP) hangar, Floyd Bennett Field, Brooklyn, NY. Photo courtesy of Phil Gilson.

WC27 Truck, 1/2 ton, 4x4, Dodge Ambulance (G-505). Registration number W-75620 (and serial number 81510469) confirms  WC-27 (1941 contract, delivered 4-42). Located at the Historic Aircraft Restoration Project (HARP) hangar, Floyd Bennett Field, Brooklyn, NY. Photo courtesy of Phil Gilson
WC27 Truck, 1/2 ton, 4x4, Dodge Ambulance (G-505). Registration number W-75620 (and serial number 81510469) confirms WC-27 (1941 contract, delivered 4-42). Located at the Historic Aircraft Restoration Project (HARP) hangar, Floyd Bennett Field, Brooklyn, NY. Photo courtesy of Phil Gilson.

Final inspection of Truck, 1/2 ton, 4x4 Dodge Ambulance at the Dodge plant, circa 1942 during World War II.  Thanks to James Fuller for correct ID
Final inspection of Truck, 1/2 ton, 4x4 Dodge Ambulance at the Dodge plant, circa 1942 during World War II. Thanks to James Fuller for correct ID.