United States Probation Officers, also referred to as Federal Probation Officers, are the largest cadre of Federal Law Enforcement Officers in the Federal Judiciary after the small division of Supreme Court Police who serve to protect the Supreme Court and its justices. Despite their law enforcement status and authority within the federal government, their investigators are referred to as Officers, not Special Agents. The Federal Probation Office emphasizes their unique role as law enforcement officers and social case workers. They hold the responsibility to investigate and supervise persons charged with and convicted of crimes against the United States. They have statutory authority to carry firearms, make warrantless arrests of those under their supervision and have jurisdiction over felons convicted in federal courts. Most districts require that all new officers attend the Probation and Pretrial Services National Training Academy at the Federal Law Enforcement Training Center soon after coming on board. Officers are eligible for a 20-year retirement and must be appointed prior to their 37th birthday because the mandatory separation age is 57. Almost all districts require prior experience in a similar field, a background suitability investigation, drug test, and medical examination as a pre-requisite for hiring. Federal Probation is unique to other federal law enforcement agencies in that they are regionally aligned to their judicial districts, rather than a single headquarters element. All officers within a district report to their Chief Probation Officer or Chief Pretrial Services Officer, who in turn serves the Chief District Judge. The national element is the Administrative Office of the United States Courts, Washington, DC, which provides administrative support to the courts, including staffing and other resources, and enforces policies promulgated by the Judicial Conference of the United States, the policy-making body of the Federal Judiciary. Many districts have split their Probation Officers into Pre-Sentence Investigation Units and Supervision Units. Pre-Sentence Investigators conduct comprehensive investigations into the background of defendants convicted of federal crimes. Upon completion of their investigation, they are required to employ the sentencing guidelines and submit a sentencing recommendation to the presiding judge. Often, they are also asked to confer privately with judges regarding their recommendation. Officers assigned to Supervision Units supervise felons convicted of federal crimes who are released into society on either Supervised Release or Probation. Supervision Officers must enforce court ordered conditions and are mandated to use their discretion and skills to mitigate the offenders risk to society. Both Supervision Officers and Pre-Sentence Investigators deal with a wide range of offenders, many of whom have extensive criminal histories. Federal Probation Officers also represent the United States Department of Justice in the performance of duties connected with federal parole.