The Federal Bureau of Investigation is perhaps the best known and most famous federal law enforcement agency. The FBI falls under the control of the United States Department of Justice and is responsible for investigating crimes related to domestic security. It includes computer crimes, financial crimes, kidnapping, and terrorist threats. FBI Special Agents work in field offices across the U.S. and around the world.

Learn about the FBI Special Agent Hiring Process here.

Homeland Security Investigations (HSI) is the principal investigative arm of the U.S. Department of Homeland Security. HSI is responsible for investigating a wide range of domestic and international activities arising from the illegal movement of people and goods into, within, and out of the United States. More than 7,100 Special Agents are assigned to 220 cities throughout the United States, and 80 overseas locations in 53 countries. Learn about the HSI Special Agent entrance exam here.

The DEA is a United States federal law enforcement agency under the U.S. Department of Justice tasked with combating drug trafficking and distribution within the U.S. The DEA has sole responsibility for coordinating and pursuing U.S. drug investigations both domestically and abroad. Learn more about the entrance exam for DEA Special Agents and how to prepare.

DEA Diversion Investigators are responsible for addressing the problem of diversion of controlled pharmaceuticals and regulated chemicals from the legitimate channels in which they are manufactured, distributed, and dispensed. Learn more about the entrance exam for DEA Diversion Investigators and how to prepare.

ATFE has primary responsibility for investigating violations of federal law relating to firearms, explosives, arson, and alcohol/tobacco diversion. With approximately 2,600 special agents, ATF operates 25 field divisions throughout the United States and has overseas attaché offices in approximately half dozen countries. Learn how to prepare for the ATF entrance exam with this outstanding ATF Test Prep Course.

Secret Service Special Agents perform critical protective and investigative assignments for the US government including: (1) Providing personal protection for various protectees, (2) Conducting criminal investigations pertaining to financial obligations of the United States, and (3) Planning and implementing security designs for National Special Security Events. Learn more about the Secret Service Special Agent Entrance Exam (SAEE) here.

The Federal Air Marshal Service is a plain-clothes part of the Transportation Security Administration (TSA). It was created in 1961 to promote confidence in the nation’s civil aviation system by detecting, deterring, and defeating hostile acts that target U.S. aircraft, passengers and crew members. Learn how to prepare for the Federal Air Marshal Test Battery.

FBI Police Officers play a crucial role in the mission of the FBI. They help keep the Bureau secure by protecting FBI personnel and property.

The FBI's Police Officer Selection System (POSS) is a challenging process designed to find only the most capable applicants. Learn how to prepare for the FBI Police Officer Entrance Exam here.

The U.S. Capitol Police protect the legislative process and the millions of visitors who travel to Washington DC to see democracy in action each day. USCP Officers are responsible for security, urban crime prevention, dignitary protection, specialty response capabilities, and homeland security. Learn more about the USCP hiring process here.

The Uniformed Division’s mission is to protect facilities and venues secured for U.S. Secret Service protectees. This includes: (1) Providing protection for The White House Complex, The Vice President's Residence, The Main Treasury Building and Annex, and foreign diplomatic missions and embassies in the Washington, D.C. area, and (2) Traveling in support of the Presidential, Vice Presidential, and foreign heads of state/government missions. Learn about the Uniformed Division Entrance Exam (UDEE) here.

Border Patrol Agents are focused 24/7 on securing our international land borders and coastal waters between ports of entry. They safeguard the American people from terrorists and their weapons, drug smugglers, and illegal entry of undocumented immigrants. Learn more about the Border Patrol Agent Entrance Exam.

CBP Officers work in a fast-paced environment at 328 ports of entry throughout the United States. They are responsible for border security at the ports of entry, including counterterrorism, customs, immigration, trade, and agriculture. Learn more about the CBP Entrance Exam.

Transportation Security Officers (TSO) are responsible for providing security and protection of air travelers in a courteous and professional manner. Transportation Security Officers are the face of the agency, the people on the front lines and the most important role at TSA. For many people, working as a TSO has led to a long, fulfilling career with the federal government. Learn about the hiring process for Transportation Security Officers here.

The Amtrak Police Department (APD) is a national police force committed to protecting the customers and employees of Amtrak. APD protects over 30 million customers traveling to more than 500 destinations in 46 states, on more than 21,400 miles of routes. APD partners with other law enforcement agencies to provide a police presence at a majority of Amtrak stations and along the rights-of-way. Learn more about the written exam required to become an Amtrak Police Officer.

The Pentagon Force Protection Agency (PFPA) seeks highly qualified and motivated applicants to serve as uniformed Federal Police Officers at the Pentagon, and at the Raven Rock Mountain Complex in Adams County, PA. Check USAJobs regularly for open positions. Entry-level Pentagon Police Officer applicants must pass the NPOST Written Exam in addition to a physical evaluation battery.

The primary duty of uniformed division officers is to provide general law enforcement and protection services to Federal Reserve facilities, whether owned or leased. Federal Reserve officers respond to police, fire and medical incidents in and adjacent to their assigned facilities. Check USAJobs regularly for open positions. Entry-level Federal Reserve Police applicants must pass the NPOST Written Exam in addition to a physical evaluation battery.

United States Park Police Officers are responsible for protecting personnel, facilities and land areas of the National Park Service and neighboring communities, thus providing a safe haven for enjoyment of these areas without fear. Check USAJobs regularly for open positions. Entry-level U.S. Park Police applicants must pass the NPOST Written Exam in addition to a physical fitness test.

The primary duty of uniformed division officers is to provide general law enforcement and protection services to personnel and facilities of the National Security Agency (NSA) at Fort Meade, Maryland. Check USAJobs regularly for open positions. Entry-level NSA Police applicants must pass the NPOST Written Exam in addition to a physical evaluation battery.