What's a drone? How is US drone policy changing?

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FILE - In this Jan. 31, 2010 file photo, an unmanned U.S. Predator drone flies over Kandahar Air Field, southern Afghanistan, on a moon-lit night. An American citizen killed in a U.S. drone strike in Pakistan in 2011 was arrested by Pakistani authorities three years earlier but escaped after being released on bail, officials said Thursday, May 23, 2013. (AP Photo/Kirsty Wigglesworth, File)

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What's a drone? ... FILE - In this Jan. 31, 2010 file photo, an unmanned U.S. Predator drone flies over Kandahar Air Field, southern Afghanistan, on a moon-lit night. An American citizen killed in a U.S. drone strike in Pakistan in 2011 was arrested by Pakistani authorities three years earlier but escaped after being released on bail, officials said Thursday, May 23, 2013. (AP Photo/Kirsty Wigglesworth, File)
Some unions now ... FILE - In this Sept. 7, 2009, file photo President Barack Obama speaks at the AFL-CIO Labor Day picnic at Coney Island in Cincinnati. Some labor unions that initially backed Obama's health care overhaul are now frustrated and angry about what they say are unexpected consequences of the plan that could hurt their members. (AP Photo/David Kohl, File)
IRS replaces off... In this May 22, 2013, photo, Lois Lerner listens on Capitol Hill in Washington. A day after she refused to answer questions at a congressional hearing, Lerner has been replaced as director the Internal Revenue Service division that oversaw agents who targeted tea party groups. Danny Werfel, the agency's new acting commissioner, told IRS employees in an email Thursday, May 23, 2013, that he has selected a new acting head of the division, staying within the IRS to find new leadership. (AP Photo/J. Scott Applewhite)
Obama balances t... President Barack Obama pauses as his speech is interrupted by CODEPINK founder Medea Benjamin, Thursday, May 23, 2013, at the National Defense University at Fort McNair in Washington. CODEPINK is a women-initiated grassroots peace and social justice movement working to end U.S. funded wars and occupations, to challenge militarism globally, and to redirect our resources into health care, education, green jobs and other life-affirming activities. (AP Photo/Pablo Martinez Monsivais)
GOP's Walker tou... Wisconsin Gov. Scott Walker delivers an address at a fundraising event for the Iowa GOP on Thursday, May 23, 2013 at the Sheraton Hotel in West Des Moines, Iowa. (AP Photo/The Des Moines Register, Charlie Litchfield)
Milestones for G... FILE - In this July 16, 2009 file photo, reviewed by the U.S. military, flags hang above the sign marking the Camp Justice compound, the site of the U.S. war crimes tribunal, at Guantanamo Bay U.S. Naval Base, Cuba. President Barack Obama's speech national security speech Thursday is expected to reaffirm his national security priorities _ from homegrown terrorists to killer drones to the enemy combatants held at the military-run detention center at Guantanamo Bay, Cuba _ but make no new sweeping policy announcements. (AP Photo/Brennan Linsley, File)
Maine governor m... In this April 18, 2013 photo, Maine Gov. Paul LePage smiles during a ceremony at the Blaine House in Augusta, Maine. Maine Democratic legislative leaders say Gov. Paul LePage is threatening to move his office space out of the State House by July 1. LePage's decision stems from a disagreement over a television screen in the State House hall of flags outside LePage's office. LePage on Thursday, May 23, 2013 accused Democrats of a pattern of "toxic" censorship, noting that Democrats declined to let him speak at a recent budget committee meeting. (AP Photo/Pat Wellenbach)
Obama sees narro... President Barack Obama continues to speaks about national security, Thursday, May 23, 2013, at the National Defense University at Fort McNair in Washington, as CODEPINK founder Medea Benjamin of Code Pink shouted at him from the back of the auditorium. (AP Photo/Carolyn Kaster)
Tea party vs. ol... FILE - In this Feb. 7, 2013, file photo, Senate Armed Services Committee member Sen. John McCain, R-Ariz., right, questions Defense Secretary Leon Panetta and Joint Chiefs Chairman Gen. Martin Dempsey, on Capitol Hill in Washington. The committee's ranking Republican Sen. James Inhofe, R-Okla. listens at left. A long-simmering feud in the Senate between establishment Republicans and tea partyers breaks into full view, with McCain accusing younger colleagues of overplaying their hands and tempting Democrats to change Senate rules that protect the minority party. How to deal with the budget and debt become the latest quarrel in a string of them between McCain _ sometimes joined by other traditionalist Republicans _ and brash, tea party-champions such as Ted Cruz of Texas, Rand Paul of Kentucky and Mike Lee of Utah. (AP Photo/J. Scott Applewhite)
House immigratio... House Speaker John Boehner of Ohio listens to a reporter's question during a news conference on Capitol Hill in Washington, Thursday, May 23, 2013. (AP Photo/Charles Dharapak)
Obama: Policy in... FILE - In this May 15, 2013 file photo, Attorney General Eric Holder, the nation's top law enforcement official, testifies on Capitol Hill in Washington. (AP Photo/J. Scott Applewhite, File)
Smooth confirmat... Chicago billionaire business executive Penny Pritzker, President Obama's pick for Commerce Secretary, testifies on Capitol Hill in Washington, Thursday, May 23, 2013, before the Senate Commerce Committee hearing on her nomination. A longtime Obama friend who raised hundreds of thousands of dollars for both of his presidential campaigns, Pritzker is facing scrutiny at a Senate confirmation hearing for her ties to a subprime mortgage lender that failed in 2001. (AP Photo/J. Scott Applewhite)
House backs vari... FILE - In this Feb. 7, 2011 file photo, Rep. Peter Welch, D-Vt. speaks at a news conference in Barre, Vt. Dismissing a veto threat from President Barack Obama, lawmakers in the Republican-led House approved legislation that links student loan rates to the ups and downs of the financial markets. (AP Photo/Toby Talbot, File)
Report: Nation's... FILE - In this Dec. 11, 2012 file photo, students hold their position during a yoga class at Capri Elementary School in Encinitas, Calif. Reading, writing, `rithmetic _ and PE? The prestigious Institute of Medicine is recommending that schools provide opportunities for at least 60 minutes of physical activity each day for students and treat physical education as a core subject. The report says only about half of the nation's youngsters are getting at least an hour of vigorous or moderate physical activity every day. (AP Photo/Gregory Bull, File)
Anti-war protest... CODEPINK founder Medea Benjamin is surrounded by security as she shouts at President Barack Obama during his speech on national security, Thursday, May 23, 2013, at the National Defense University at Fort McNair in Washington. She was removed from the auditorium. (AP Photo/Carolyn Kaster)
Obama endorses m... President Barack Obama talks about national security, Thursday, May 23, 2013, at the National Defense University at Fort McNair in Washington. Declaring America at a "crossroads" in the fight against terrorism, the president Barack revealed clearer guidelines for the use of deadly drone strikes, including more control by the U.S. military, while leaving key details of the controversial program secret. (AP Photo/Carolyn Kaster)
Between economy ... President Barack Obama and first lady Michelle Obama watch as singer-songwriter Carole King performs after being presented the Library of Congress Gershwin Prize for Popular Song during an East Room concert honoring King Wednesday, May 22, 2013, at the White House in Washington. (AP Photo/Jacquelyn Martin)
US, Israel raise... U.S. Secretary of State John Kerry, left, meets with Israeli Prime Minster Benjamin Netanyahu in Jerusalem Thursday, May 23, 2013. The United States and Israel are raising hopes for a restart of the Middle East peace process after more than four years of hardly any talks. (AP Photo/Jim Young, Pool)
U.S. names veter... U.S. ENVOY TO THE AFGHAN OPPOSITION JAMES DOBBINS TALKS TO THE PRESS IN ROME.
Obama tells Mexi... U.S. President Obama delivers a speech during his visit to Mexico City
Obama blesses Me... U.S. President Obama alights from Air Force One as he begins his visit to Mexico City
Arizona governor... Arizona Governor Jan Brewer addresses the media about the Supreme Court's decision on SB1070 in Phoenix.
Rhode Island law... Rhode Island Governor Lincoln Chafee uncaps his pen as he signs the Marriage Equality Act into law at the State House in Provide
Jury convicts tw... New York City Comptroller John Liu speaks in support of a demonstration against the NYPD's "stop and frisk" crime-fighting tacti
NRA to meet in T... Man rides down an escalator at the George R. Brown Convention Center, ahead of the National Rifle Association's annual meeting i
Florida lawmaker... Florida Governor Scott greets an attendee in the audience before the start of the final U.S. presidential debate in Boca Raton
BlackBerry devic... A new Blackberry Z10 smartphone is displayed at a store in New York
Analysis: Doubli... U.S. President Barack Obama nominates Pritzker and Froman at White House in Washington
Bloomberg makes ... New York Mayor Michael Bloomberg delivers the 2014 city budget in the Blue Room of New York's City Hall
States balk at m... President Obama's fiscal 2014 budget proposal is released and distributed to Senate staff members on Capitol Hill in Washington
Kerry to raise c... U.S. Secretary of State John Kerry delivers a statement after a meeting with Afghan President Hamid Karzai and Pakistani Army Ch
Maryland becomes... Maryland Governor O'Malley addresses the 2012 Democratic National Convention in Charlotte
Personality-driv... Democrat Colbert Busch makes a point during the South Carolina 1st Congressional district debate with former South Carolina Gove
Lawmakers call f... An aerial view shows the aftermath of a massive explosion at a fertilizer plant in the town of West, near Waco, Texas
Obama rounds out... U.S. President Barack Obama announces new nominees at the White House in Washington
Lawyers plot gam... A computer screen displays an online gambling website
Illinois Senate ... Chicago Mayor Emanuel smiles while attending U.S. President Obama's election night rally in Chicago
Obama quietly si... U.S. President Barack Obama is pictured as first lady Michelle Obama (not pictured) speaks during an event on finding employment
In Obama's jargo... U.S. President Barack Obama speaks at the National Academy of Sciences in Washington
Obama considers ... U.S. President Barack Obama speaks to the media in the Brady Press Briefing Room at the White House in Washington
Obama taps ally,... U.S. President Obama announces Watt as his nominee for director of the FHFA and Wheeler to head FCC, in Washington
Fierce lobbying ... Men transport humanitarian food aid onto pirogues at Mopti
Obama won't rush... A man searches for survivors from the rubble of a damaged area in Al-Sukkari neighborhood in Aleppo