The color green is sacred in Islam, which is why an emerald made such an ideal surface on which to inscribe a religious text. The gem itself is believed to have been mined in Colombia, home to the most spectacular green emeralds in the world.
Securing and Managing Our Borders. Protecting the nation's bordersâland, air, and seaâfrom the illegal entry of people, weapons, drugs, and contraband is vital to our homeland security, as well as economic prosperity. Over the past several years, DHS has deployed unprecedented levels of personnel, technology, and resources to the Southwest border.
Here are a few: 1  The growing fence between the U.S. (core) and Mexico (periphery) to prevent the entrance of unauthorized immigrants. 2  The Demilitarized Zone between North and South Korea. 3  Air and naval patrols on the waters between Australia and Southeast Asia and between the EU and North Africa to keep out unwanted immigrants.