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In page Infantry:

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Historically, infantry have suffered high casualty rates from disease, exposure, exhaustion and privation—often in excess of the casualties suffered from enemy attacks.[5] Better infantry equipment to support their health, energy, and protect from environmental factors greatly reduces these rates of loss, and increase their level of effective action. Health, energy, and morale are greatly influenced by how the soldier is fed, so militaries issue standardised field rations that provide palatable meals and enough calories to keep a soldier well-fed and combat-ready.[citation needed]