Note the white Hebrew letter lamedh (the predecessor to our letter "L") on the blue background. It stands for lomed, or learner. This sign appears on all drivers training vehicles in Israel, including those used to train new civilian auto drivers.
Sherman Tank Hull for Drivers' Training
The widespread use of the Sherman by the Armored and Artillery Corps in the 1050-60s prompted the IDF to modify some for drivers' training. The turret opening was closed with a round steel plate that had a central opening for the instructor.