This thesis explores the doctrinal divide among homeland defense (HD), homeland security (HS), and defense support to civil authorities (DSCA) and questions whether these doctrinal spaces are adequately instructive to National Guard domestic action. The thesis explores the Department of Defenses (DoD) important contributions to HD and DSCA and the Guards historical and contemporary roles in HD and HS. This work proposes that the DoDs reticence to describe its actions as HS creates a doctrinal void for the Guard. This thesis advances DSCA as theoretically and practically useful for the DoD but concurrently contravenes core principles of domestic response, which is practically inadequate for domestic Guard action. By exploring military action in large-scale, complex disasters and national special security events, this thesis provides insight into the legal, policy, and fiscal challenges and solutions for clearer domestic doctrine. The thesis explores whether the Guard can be better employed in disasters by adjudicating matters of defense over security and engaging in a federalism conversation aimed at discriminating between disasters that are national matters and those that are state matters.
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