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In page M7 Priest:

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M7 Priests remained in use during the Korean War, where their flexibility, compared to towed artillery units, led the U.S. Army on the path to converting fully to self-propelled howitzers.[1] The limited gun elevation of the M7 (35 degrees) hampered its ability to shoot over the tall Korean mountains, so 127 M7B1s were modified to permit the full 65 degrees elevation in a model known as the M7B2. After the Korean War, many of these were exported to NATO countries, notably Italy and Germany.[2]