Question: Arlington Southwest is a cemetery dedicated to the soldiers from Texas lost in what Operation?

Context articles: Rough Riders Memorial
Wyman Meinzer
Panteón Nacional Román Baldorioty de Castro
Gaza War Cemetery
2003 invasion of Iraq
Arlington Southwest
Singing Hills Memorial Park
McClellan Gate
Sai Wan War Cemetery
United States National Cemetery System

The Rough Riders Memorial is a memorial in Arlington National Cemetery in Arlington County, Virginia, in the United States that commemorates those members of the "Rough Riders" who died in the Spanish–American War in 1898.
 The grey granite shaft was erected by surviving members of the Rough Riders and their friends and supporters.
 Although Arlington National Cemetery, a number of secondary sources, and even the bronze plaque on the memorial say the monument was dedicated in 1906 and one source says 1905, contemporary newspaper accounts show the memorial was dedicated on April 12, 1907.
Wyman P. Meinzer is a photographer from Benjamin, Texas.
 In a review of 'Texas Lost', "The Dallas Morning News" said Meinzer "just might be the best nature photographer in Texas.
 He has had more than 250 magazine cover photos published.
 He also has 17 photography books published.
 George W. Bush named him state photographer of Texas in 1997.
 As of 1997, Meinzer taught photography at Texas Tech and hunted coyotes and bobcats in the winter months.
 Meizner's photos illustrate "Texas Past: Enduring Legacy" (Texas Parks and Wildlife Press) written by Andrew Sansom.
The Panteón Nacional Román Baldorioty de Castro (English: Román Baldorioty de Castro National Pantheon) is a tract of land in Barrio Segundo of the city of Ponce, Puerto Rico, originally designed as the city's cemetery, but later converted into what has come to be a famous burial place.
 Established in 1842, it is Puerto Rico's first (and only) national pantheon.
 It is the only cemetery dedicated as a museum in Puerto Rico and the Caribbean.
 Prior to being dedicated as a Panteon Nacional, it was known as Cementerio Viejo or as Cementerio Antiguo de Ponce, and is listed under that name on the U.S. National Register of Historic Places.
 The Pantheon is named after Román Baldorioty de Castro, a prolific Puerto Rican politician, and firm believer of Puerto Rican autonomy and independence.
 His remains are located here.
 The Pantheon also houses a small museum about the history of autonomism in the Island, and it is currently used both as a park and a venue for the expression of culture and the arts.
 It is called the Museo del Autonomismo Puertorriqueño.
The Commonwealth Gaza War Cemetery, often referred to as the British War Cemetery, is a cemetery administered by the Commonwealth War Graves Commission on the Salah al-Din Road in Gaza City's Tuffah district.
 The cemetery is 1.5 km in size.
 The majority of burials at the cemetery are of Allied soldiers who lost their lives in World War I.
 Some 3,217 British and Commonwealth servicemen are buried in the cemetery; nearly 800 of the graves lack identification, and are inscribed "Soldier of the Great War, known unto God".
 234 graves of non-Commonwealth soldiers are also present in the cemetery.
 A further 210 Commonwealth soldiers were interred in the cemetery following their death in World War II; the post-war period saw 30 more burials.
The 2003 invasion of Iraq lasted from 20 March to 1 May 2003 and signalled the start of the Iraq War, which was dubbed Operation Iraqi Freedom by the United States (prior to 19 March, the mission in Iraq was called Operation Enduring Freedom, a carryover from the War in Afghanistan).
 The invasion consisted of 21 days of major combat operations, in which a combined force of troops from the United States, the United Kingdom, Australia and Poland invaded Iraq and deposed the Ba'athist government of Saddam Hussein.
 The invasion phase consisted primarily of a conventionally fought war which included the capture of the Iraqi capital of Baghdad by American forces with the implicit assistance of the United Kingdom, alongside Australia and Poland.
Arlington Southwest is an unoccupied cemetery located in Brewster County, Texas, 4 mi east of Alpine along U.S. Highway 90.
 Each gravestone serves as a memorial for each individual soldier from Texas killed during the invasion and occupation of Iraq of the early 21st century.
 Developed by the Big Bend Veterans for Peace, Arlington Southwest is believed to be the first permanent memorial dedicated to those fallen in the war similar to those established as the temporary Arlington West memorials in California in 2003.
Singing Hills Memorial Park is a cemetery dedicated in 1996.
 It is located on the outskirts of El Cajon, California in the Dehesa Valley.
 A 65 acre wildlife preserve surrounds the dedicated 35 acre of burial, mausoleum and cremation property.
The McClellan Gate (sometimes known as the McClellan Arch) is a memorial to Major General George B. McClellan located inside Arlington National Cemetery in Arlington County, Virginia, in the United States.
 Constructed about 1871 on Arlington Ridge Road (then the eastern boundary of the cemetery), it served as a main gate until about 1879 when the Sheridan Gate was constructed.
 The McClellan Gate became nonfunctional in 1966 when the road closed, and expansion of the cemetery eastward in 1971 left the gate deep inside Arlington.
 It is the only gate constructed on the cemetery's eastern boundary in the 1800s that survives.
Sai Wan War Cemetery () is a military cemetery located in Chai Wan, Hong Kong which was built in 1946.
 The cemetery commemorates soldiers from both the First World War and the Second World War.
 Sai Wan War Cemetery mostly contains the graves of soldiers from the Commonwealth and Allied Forces (predominantly from the Indian sub-continent) who died in the Battle of Hong Kong.
 According to the Commonwealth War Graves Commission (CWGC), the commemorative graves/plaques of 914 soldiers from Undivided India are grouped in 3 memorial locations within the Sai Wan cemetery complex : 104 Indian soldiers whose tombstones are located on the slopes of Sai Wan Cemetery, 287 more Indian soldiers interred at Sai Wan Memorial while a further 118 Indian soldiers whose remains were cremated according to their religious customs are inscribed on commemorative plaques at the "Sai Wan Cremation Memorial".
 The Sai Wan War Cemetery contains the graves of 228 Canadians.
.
The United States National Cemetery System is a system of 147 nationally important cemeteries in the United States.
 The authority to create military burial places came during the American Civil War, in an act passed by the U.S. Congress on July 17, 1862.
 By the end of 1862, 14 national cemeteries had been established (see text of photo).
 A national cemetery is generally a military cemetery containing the graves of U.S. military personnel, veterans and their spouses, but not exclusively so.
 The best known national cemetery is Arlington National Cemetery in Arlington County, Virginia, outside Washington, D.C..
 Some national cemeteries, especially Arlington, contain the graves of important civilian leaders and other important national figures.
 Some national cemeteries also contain sections for Confederate soldiers.
 In addition to national cemeteries, there are also state veteran cemeteries.