Columbia subject headings:
National security--Technological innovations--United States--Finance.
United States. Dept. of Homeland Security--Appropriations and expenditures.
United States. Dept. of Homeland Security--Information technology--Finance.
Harvard subject headings:
National security--Technological innovations--United States--Finance.
United States. Department of Homeland Security--Appropriations and expenditures.
United States. Department of Homeland Security--Information technology--Finance.
Princeton subject headings:
National security--Technological innovations--United States--Finance.
United States. Department of Homeland Security--Appropriations and expenditures.
United States. Department of Homeland Security--Information technology--Finance.