

http://mngca.org/node/370
Through various studies the Center for Disease Control (CDC) and the Department of Defense (DoD) developed what is termed the DoD Repellent System. The DoD Repellent System is comprised of two different types of barriers. There are only two chemicals approved for use in the DoD protection system. When used together, they provide nearly 100% protection from ticks, mosquitoes, chiggers, fleas and other marauding insects. Both of these repellents are approved by the CDC and by the Environmental Protection Agency (EPA). They are N-diethyl-meta-toluamide more commonly known as DEET and Permethrin.
The use and application method of both agents is different and to be effective must be used in combination with each other. DEET is a repellent and Permethrin is an insecticide.