Agents at the Air and Marine Operations Center at an Air Force Reserve base in Riverside, Calif., track 20,000 to 25,000 flights a day for suspicious activity. Master Sgt. Julie Avey/AMOC hide caption

itoggle caption Master Sgt. Julie Avey/AMOC

More than 350 towns and cities in Texas have banned new billboards, but billboards companies are still pressing for new and taller signs. John Burnett hide caption

itoggle caption John Burnett

Thanks to unusually heavy monsoon rains, mesa land east of Ghost Ranch in New Mexico has erupted into vibrant green life — an unusual sight in this region. courtesy Harvey Day hide caption

itoggle caption courtesy Harvey Day

Thousands of young immigrants, many of them from Central America, have crossed illegally into the United States this year, causing an unprecedented humanitarian crisis on the U.S.-Mexico border. John Moore/Getty Images hide caption

itoggle caption John Moore/Getty Images

Child detainees in a holding cell at a Border Patrol facility in Brownsville, Texas. Some human smugglers who bring children across the Rio Grande make sure to treat their clients well. Eric Gay/AP hide caption

itoggle caption Eric Gay/AP

Boys in a holding area at a Border Protection center in Nogales, Ariz. Generally, minors are put into deportation proceedings and given a "Notice To Appear" in immigration court, but they have permission to stay in the country while the U.S. decides their fate. Ross D. Franklin/AP hide caption

itoggle caption Ross D. Franklin/AP

Senate Minority Leader Mitch McConnell holds a rifle on stage at the Conservative Political Action Committee annual conference earlier this year. Susan Walsh/AP hide caption

itoggle caption Susan Walsh/AP

Romero is detained at a county park near McAllen, Texas, after wading across the Rio Grande. He says he left Central America to avoid conscription by street gangs and to join his family in the U.S. John Burnett/NPR hide caption

itoggle caption John Burnett/NPR