It could be so they can work out how many bullets are fired per second on average so they can work out how many to load their gun with for a certain amount of time or how much food will be needed and eaten. Maths is very important.
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Everything.
Their weapon guidance systems work off of GPS (powered by mathematics and created using mathematics)
Their weapons themselves are designed using mathematics.
Their computer network uses mathematics.
That will be dependent on your occupation in the Army. As a general rule of thumb, yes. Even the infantry has to calculate distances and ranges for navigation, calling indirect fire, and so forth.
The military uses math to pinpiont their targets and locations of their enemies and armies.