SUNLIGHT/SUNBURN
Use a waterproof or sweat proof sun block (SPF 15 or higher) when exercising in warm weather to avoid sunburn. Follow the instructions on the bottle for proper use.
For more information related to environmental considerations, see the following websites for more detailed information.
U.S. Army Public Health Command
http://phc.amedd.army.mil/pages/default.aspx
U.S. Army Research Institute of Environmental Medicine
http://www.usariem.army.mil/
http://www.usariem.army.mil/Pages/download/heatacclimatizationguide.pdf
http://www.usariem.army.mil/Pages/download/altitudeacclimatizationguide.pdf