(All truck cues are combined)

External size cues are needed to establish the size of a truck. To estimate the size of a cue, the gunner compares a nearby tree or other background feature to the size of the red spot.

He can also use the reticle to gage size. This is most accurate at low to medium settings.

Side-View Identification. Truck characteristics visible from both sides include—

• A prominent square, also visible from the front, that indicates a front engine. The entire hood and radiator usually appear hot, and the front wheels may seem to merge into the image of the engine.

• Warm spots, separated from the front wheels, that indicate rear wheels. These are easily distinguished from a track pattern.

• Silhouettes of the cab and hood, which may appear at maximum settings. (Long-bed trucks often appear as other truck shapes from the side, even at long ranges.)

• A diagonally-angled drive shaft that is often visible as a bright area joining the engine and rear wheels.

• Exhaust pipes and stacks, which appear hot along their entire length. These appear as different shapes, depending upon how they are routed through the vehicle's frame.

Front-View Identification. Truck characteristics commonly visible from the front include—

• A bright red square or rectangle, indicating the engine compartment, hood, radiator, and, if a personnel heater is in use, the cab. Front views of trucks are all similar at medium and long ranges.

• Wheels and a front axle area that often merge into a continuous red spot beneath the engine. Lower settings improve this image so the gunner can see the vehicle's wheels.

• Canvas and wood parts. These parts usually appear cool at night and warm during the day.

Figure I-5. Trucks.

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