It's used to order a unit to form up against a doorway or entrance in order to begin breaching and then clearing an area or room. When forming up you can be carrying certain tools or weapons for the breach and so have to be at the right position in the "stack".
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It would depend on which army you mean and the precise rank.
Do you mean: "What does ARVN mean? (What does ARVN stand for?). ARVN was an acronym for Army Republic (South) Vietnam. NVA was the counterpart and stood for North Vietnamese Army.
The statement means that the Hoods Arm was luckier than any other army because it did not lose many casualties.
Please clarify. Do you mean Belgium's army? I cannot find any country called Beblium.