The OA vz. 30 (full name Obrněný automobil vzor 30, ) was a Czechoslovak-designed armored car used by Nazi Germany, Slovakia, Romania and Hungary during World War II. Fifty-one were built, of which the Germans seized twenty-four when they occupied Bohemia-Moravia in March 1939 and the Slovaks captured eighteen when they declared independence from Czechoslovakia at the same time. Romania acquired nine when Czech troops sought refuge in Romania after the Hungarian invasion of Carpatho-Ukraine that same month. Slovak vehicles saw combat in the Slovak-Hungarian War, the invasion of Poland, the opening months of Operation Barbarossa and the Slovak National Uprising. Description The OA vz. 30's armored body was mounted on a Tatra 6 × 4 T-72 truck chassis. The chassis design was unusual as it was a central tube design with independently sprung rear half-axles which gave good cross-country performance. The driver sat on the right side using an observation port protected by an armored shutter with a vision slit. The assistant driver sat on the left and had a small vision port for his ZB vz. 26 light machine gun. It was mounted in a firing slit directly to his front. There were similar vision ports on both sides. The crew accessed the fighting compartment from a door in the rear of the vehicle. The gunner sat in a small, cylindrical turret with 360° of traverse. It had an observation port in the front and vision slits on both sides and the rear. The turret had another ZB vz. 26 in a ball mount. Another machine gun was carried inside the vehicle. 3000 rounds were stored for the machine guns. The armor ranged between thick; this was deemed enough to deflect ordinary bullets fired from over distance. The , air-cooled, , four-cylinder boxer Tatra 71 engine was mounted in the front. It gave a top speed of . The vehicle could cross a ditch wide, climb an obstacle high and ford a stream deep. Development The development history for the OA vz. 30 is difficult to sort out, but the Czech Army had been evaluating various Tatra truck chassis for use as armored cars since 1926 with a number of prototypes built over the years with both wooden and metal bodies to test vehicle layouts. An order was finally placed on 6 March 1933 for fifty-one for delivery in December. Tatra was late and only delivered the first