Preserve National Security I Industries essential to national security receive government-sponsored protection for both imports and exports. a. Imports Governments restrict imports to guarantee domestic supply, which preserves national security. Many countries fiercely protect their agricultural sector for national security reasons because a nation that imports its food supplies could face starvation in times of war. b. Exports Governments have national security motives for banning certain defense-related goods from export to other nations. Agencies review requests to export technologies or products that have dual uses meaning they have both industrial and military