This Army Techniques Publication, "Army Health System Support to Stability and Defense Support of Civil Authorities Tasks," ATP 4-02.42, establishes Army Health System (AHS) support doctrine and provides the guiding principles for the provision of medical support to stability and defense support of civil authorities (DSCA) tasks. Army Techniques Publication 4-02.42 examines the various situations in which Army medical personnel may be required to provide support for stability and DSCA tasks. While the Department of Defense (DOD) is not a provider of first resort in disasters, requests for support from U.S. forces may be required when military-unique capabilities (such as lift capability, engineering, or deployable medical support) exist that can expedite relief efforts during urgent, life-threatening situations.