Question: In what city is the Fort that Lester Martínez López headed the Army Medical and Research Command at located?

Context paragraphs:
Kevin C. Kiley: Major General (Ret.)  Kevin C. Kiley (born October 18, 1950) was the 41st Surgeon General of the United States Army and commander of the U.S. Army Medical Command, Fort Sam Houston, Texas.  He was commander of Walter Reed Army Medical Center and North Atlantic Regional Medical Command twice, from 2002 to 2004, and as acting commander, March 1–2, 2007.  He submitted his request to retire from the U.S. Army on March 11, 2007, in the wake of the Walter Reed Army Medical Center neglect scandal, and was removed from his nominative billet as a Lieutenant General.  Pending retirement, he was assigned to a temporary billet at the General Officer Management Office at the Pentagon in the grade Major General.  His retirement in the grade of Major General was subsequently approved.

Fort Detrick: Fort Detrick is a United States Army Medical Command installation located in Frederick, Maryland.  Historically, Fort Detrick was the center of the US biological weapons program from 1943 to 1969.  Since the discontinuation of that program, it has hosted most elements of the United States biological defense program.

Pakistan Army Medical Corps: The Pakistan Army Medical Corps, Urdu: ﺁرمى مڈيكل كور; "Army Medical Corps", abbreviated as the AMC and popularly known as Medical Corps, is a military administrative non-combatant staff corps, and a primary military medical command of the Pakistan Army.  Initially part of the Indian Army Medical Corps, it was born in 1947 and served since Pakistan's independence in 1947.  It is a vital part of Pakistan Army, serving in a support and military medical role.  The corps also has a secondary role of providing civil services in health, rehabilitation and disaster relief to the wider Pakistan community."

United States Army Medical Materiel Agency: The United States Army Medical Materiel Agency (USAMMA), a subordinate unit of the U.S. Army Medical Research and Materiel Command (USAMRMC) at Fort Detrick, Maryland, serves as the U.S. Army's executive agent for strategic medical acquisition and logistics programs.

Toni Martínez: Antonio Martínez López (born 30 June 1997), commonly referred to as Toni Martínez, is a Spanish professional footballer who plays as a forward for Premier League club West Ham United.  He has represented Spain at under-17 and under-19 level.  Prior to joining West Ham, Martínez played for Real Murcia and Valencia at under-19 youth level.

Fort Bragg: Fort Bragg, North Carolina, is a military installation of the United States Army and is the largest military installation in the world (by population) with more than 50,000 active duty personnel.  The installation is located within Cumberland, Hoke, Harnett and Moore counties.  The installation borders the towns of Fayetteville, Spring Lake and Southern Pines.  It was also a census-designated place in the 2010 Census, during which a population of 39,457 was identified.  It is named for Confederate General Braxton Bragg.  It covers over 251 sqmi .  It is the home of the Army's XVIII Airborne Corps and is the headquarters of the United States Army Special Operations Command, which oversees the U.S. Army 1st Special Forces Command (Airborne) (Provisional) and 75th Ranger Regiment.  It is also home to the U.S. Army Forces Command, U.S. Army Reserve Command, and Womack Army Medical Center.  Fort Bragg maintains two airfields: Pope Field, where the United States Air Force stations global airlift and special operations assets as well as the Air Force Combat Control School, and Simmons Army Airfield, where Army aviation units support the needs of airborne and special operations forces on post.

Building 40 (Army Medical School): Building 40, Army Medical School is a Georgian revival structure in the Walter Reed Army Medical Center complex in northern Washington, D.C., USA.  It was built between 1922 and 1932 to house the Army Medical School, which became the Army Medical Center in 1923 when it — under the name “Medical Department Professional Service School” (MDPSS) — combined with the Walter Reed General Hospital.  The MDPSS ultimately became the Walter Reed Army Institute of Research, which occupied Building 40 from 1953 to 1999.  It comprises four wings, known as the Craig (1924), Sternberg and Vedder (1932), and Siler (1962) Pavilions and is situated at 14th and Dahlia Streets.

George W. Weightman: Major General George W. Weightman was a U.S. Army Family Medicine physician who was commander of the North Atlantic Regional Medical Command and Walter Reed Army Medical Center (WRAMC).  He was relieved of his WRAMC command on March 1, 2007, in the wake of the Walter Reed Army Medical Center neglect scandal.  He took command of the U.S. Army Medical Research and Materiel Command in November 2007 and retired from active duty on 31 March 2009.

Lester Martínez López: Major General Lester Martínez López (Ret.) , MD, MPH, (born 1955) is the first Hispanic to head the Army Medical and Research Command at Fort Detrick, Maryland.  His responsibilities included overseeing the Army Medical Research Institute of Infectious Disease, which develops antidotes and vaccines for diseases soldiers might face on the battlefield.

U.S. Army Medical Materiel Center – Korea: The United States Army Medical Materiel Center-Korea (USAMMC-K), a subordinate unit of the U.S. Army Medical Research and Materiel Command at Fort Detrick, Maryland, serves as the Defense Logistics Agency's Theater Lead Agent for Medical Materiel (TLAMM) for Korea.

Supporting paragraphs: Lester Martínez López Fort Detrick
Answer: Frederick, Maryland