[8][9] The corporate headquarters were in an unincorporated part of Fairfax County near Falls Church, Virginia, while the company's contracts were managed from its office at Alliance Airport in Fort Worth, Texas.

DynCorp provided services for the U.S. military in several theaters, including Bolivia, Bosnia, Somalia, Angola, Haiti, Colombia, Kosovo and Kuwait.

During the 1950s its California Eastern Airways division supported the Korean War, the DEW Line, US activities in the Philippines, French Indochina and maintained personnel in Tokyo, Hawaii, Wake Island, one of the largest such operators.

[22] California Eastern Airways was founded by a small group of returning World War II pilots who wanted to break into the air cargo business.

[24][25] California Eastern Airways diversified into multiple government aviation and managerial jobs, airlifted supplies for the Korean War, and was responsible for the White Sands Missile Range (a client that DynCorp has retained for 50 years).

[25] In 1952 the company, renamed California Eastern Aviation, Inc., merged with Air Carrier Service Corporation (AIRCAR), which sold commercial aircraft and spare parts to foreign airlines and governments.

[35] Bannister, as T. Rees Shapiro wrote in his 2011 obituary, "was paid $1.65 an hour when he joined DynCorp as an electronics technician in 1953," rising to serve as its president and CEO (1985 to 1997).

[39] By the time of his retirement in 2003, Shapiro notes that Bannister "oversaw the acquisition of more than 40 companies… [and] was credited with helping to mold… an aviation services company into a sprawling conglomerate that employed 24,000 people and earned $2.4 billion in annual revenue.

[23] By 2003 roughly half of DynCorp's business came from managing the IT departments of the Central Intelligence Agency, Federal Bureau of Investigation, and the U.S. Securities and Exchange Commission, among others.

On April 12, 2010, DynCorp International announced a conditional deal to be acquired by private equity investment firm Cerberus Capital Management for $17.55 per share ($1 billion).

[44] In December 2011 the company hired Michael Thibault, former co-chairman and commissioner of the Commission on Wartime Contracting in Iraq and Afghanistan (CWC), as vice president of government finance and compliance.

[46] On November 23, 2020, Amentum, a contractor supporting U.S. federal and allied governments, announced that it has closed the acquisition of DynCorp International (due to multiple human trafficking cases), a provider of sophisticated aviation, logistics, training, intelligence and operational solutions in over 30 countries worldwide.

[47] DynCorp International provides aviation support to reduce the flow of illicit drugs, strengthen law enforcement, and eliminate terrorism.

[52] They have also provided air operations support in Iraq, including search and rescue, medical evacuations, and transporting quick reaction forces.

DynCorp's involvement in Endeavour's final flight was part of a contract NASA awarded to the company in April 2012 to provide aircraft maintenance and operational support at various locations throughout the country.

[67] DynCorp provides aircraft maintenance in countries including the Republic of the Philippines,[68] the United States, throughout Europe, Southwest Asia, the Middle East, and Africa.

[57] Additionally, DynCorp provides aircraft maintenance support to facilities including the NAS Patuxent River,[69] Johnson Space Center in Houston, the Langley Research Center in Hampton, Virginia, NASA facilities in El Paso, Texas, Edwards Air Force Base in California,[67] and Robins Air Force Base (AFB) in Georgia.

[77] In January 2010 DynCorp International combined with World Wide Humanitarian Services (WWHS) and Casals & Associates to form DI Development.

In Africa DI Development strengthened government financial management in Ghana, assisted in peace and recovery advancement in Uganda, and led anti-corruption programs in Madagascar, Malawi, and Nigeria.

[80][81] In Latin America DI Development implemented anti-corruption, transparency, and accountability programs in Guatemala, El Salvador, Nicaragua, and Panama, and provided democracy and governance initiatives in Mexico, Bolivia, and the Dominican Republic.

[87] Through a joint venture with McNeil Technologies called Global Linguist Solutions, Dyncorp was awarded a five-year contract to provide management of translation and interpretation services to support U.S. Intelligence and Security Command (INSCOM) as part of Operation Iraqi Freedom.

[90] DynCorp president Steven Schorer expects the training and support logistics for the military and intelligence community to grow significantly in the coming years.

[95] DynCorp also formed a joint venture with Oshkosh Defense, Force Protection Industries, and McLane Advanced Technologies to pursue a $3 billion five-year Army contract for support and maintenance of mine-resistant ambush-protected vehicles.

[91] The U.S. Defense Department gave DynCorp the Nunn-Perry Award in recognition of its mentor-protege arrangement with CenterScope Technologies, in which it provided coaching in development of new markets, establishing international operations and in worldwide logistics.

On February 15, 2013, the court granted summary judgment to DynCorp, dismissing the sole remaining human health and medical monitoring claims Ecuadorian plaintiffs had brought in connection with counternarcotic aerial herbicide spraying operations in southern Colombia.

[8] On November 29, 2008, a lengthy article in The New York Times questioned the potential conflict of interest in the hiring by Veritas Capital Fund, LP, holding company for DynCorp, of Gen. Barry McCaffrey.

[107] According to Human Rights Watch, there is substantial evidence that points to the involvement of DynCorp contractors in trafficking of women and girls in Bosnia and Herzegovina, as well as violence against them.

[115] Bolkovac co-authored a book with Cari Lynn titled The Whistleblower: Sex Trafficking, Military Contractors And One Woman's Fight For Justice.

"[118] The report states that the findings of DynCorp's misconduct on a $188 million job to buy weapons and build quarters for the Iraqi police were serious enough to warrant a fraud inquiry.

[119] In February 2007 federal auditors cited DynCorp for wasting millions on projects, including building an unapproved, Olympic-sized swimming pool at the behest of Iraqi police officials.