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A-64. Extremes of temperature and humidity reduce personnel and equipment capabilities and may require the use of special shelter or equipment. Air density decreases as temperature and humidity increase. This can require reduced aircraft payloads. Temperature crossovers, which occur when target and background temperatures are nearly equal, degrade thermal target acquisition systems. The length of crossover time depends on air temperature, soil and vegetation types, amount of cloud cover, and other factors. The leader identifies critical factors about temperature, including high and low temperatures, infrared crossover times, and effects of obscurants and CBRN. Some temperature considerations include:

• How will temperature and humidity affect the unit’s rate of march?
• How will temperature and humidity affect the Soldiers and equipment?
• Will temperatures and humidity favor the use of nonpersistent chemical, biological, radiological and nuclear?

Next: A-65: Analysis of Enemy

Go Back To: U.S. Army FM 3-21.8: The Infantry Rifle Platoon and Squad