First, because the vehicle is an M109 Self-Propelled Howitzer - a 155mm artillery gun.
Second, because you can't silence anything that big.
Third, because a silencer is stupid - by the time the enemy hears the shot, he's already been hit.
Based on the design and the shooting aperture, it's very likely either a tracking device to track a shell during flight to test ballistic characteristics
OR
a 'bullet trap' (like ballistics experts use) for artillery shells to allow measurement and testing of muzzle velocity, different powder/shell designs, barrel wear effects, different muzzle break combinations, etc.
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