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1 Department of Homeland Security. 2  The Department of Homeland Securityâs (DHS) mission is to secure the Nation from the many. threats and hazards we face. DHS is always on guard; endeavoring to reduce risks to the Nation, both those we anticipate and those that may be less predictable. Our mission requires continuous.
Unsourced material may be challenged and removed. (September 2010) A computer reservations system or central reservation system (CRS) is a computerized system used to store and retrieve information and conduct transactions related to air travel, hotels, car rental, or activities. Originally designed and operated by airlines, CRSes were later extended for the use of travel agencies.