DHS' funding request is broken up into six categories: preventing terrorism and enhancing security; securing and managing our borders; enforcing and administering our immigration laws; safeguarding and securing cyberspace; ensuring resilience to disasters; and providing essential support to national and economic security.

The majority of the funding for the first category is reserved for passenger and general safety procedures, but Napolitano has outlined $125.7 million for the development of canine teams to screen air cargo. The money proposed for canine teams would be used to acquire and train 900 teams to be aid in cargo screening.

More than $270 million has been marked for explosives detection systems. Napalitano also has requested $105.2 million for passenger screening devices.

Napolitano explained that the budget reflects research obtained during the department's Quadrennial Homeland Security Review, which was completed for the first time last year.

"The FY 2012 budget proposal reflects this administration's strong commitment to protecting the homeland and the American people through the effective and efficient use of DHS resources," she told the U.S. House Committee on Homeland Security. "The department will continue to build upon past successes in several areas including securing U.S. air, land, and sea borders; safeguarding lawful trade and travel; securing federal networks; and disrupting and dismantling transnational criminal and terrorist organizations that engage in cross-border criminal activity while maximizing every taxpayer dollar we receive."