Question: Taya Kyle was the widow of this US Navy SEAL who served how many tours in the Iraq War?

Context paragraphs:
Taya Kyle: Taya Renae Kyle (née Studebaker, born September 4, 1974) is an American author, political commentator, and military veteran's family activist.  Known as the widow of US Navy SEAL Chris Kyle, she was portrayed by Sienna Miller in the 2014 film "American Sniper" about her husband's life.  Kyle is the co-author of "American Wife: A Memoir of Love, Service, Faith, and Renewal", a book about life with her husband.

American Sniper: American Sniper is a 2014 American biographical war drama film directed by Clint Eastwood and written by Jason Hall.  It is loosely based on the memoir "American Sniper: The Autobiography of the Most Lethal Sniper in U.S. Military History" (2012) by Chris Kyle, with Scott McEwen and Jim DeFelice.  The film follows the life of Kyle, who became the deadliest marksman in U.S. military history with 255 kills from four tours in the Iraq War, 160 of which were officially confirmed by the Department of Defense.  While Kyle was celebrated for his military successes, his tours of duty took a heavy toll on his personal and family life.  The film was produced by Eastwood, Robert Lorenz, Andrew Lazar, Bradley Cooper, and Peter Morgan.  It stars Cooper as Kyle and Sienna Miller as his wife Taya, with Luke Grimes, Jake McDorman, Cory Hardrict, Kevin Lacz, Navid Negahban, and Keir O'Donnell in supporting roles.

Jeffrey Eggers: Jeff Eggers formerly served in the White House for six years, most recently as President Obama’s Special Assistant for National Security Affairs.  Eggers retired from the Navy in 2013 after a 20 year career as a U.S. Navy SEAL (1993-2013).  His many operational tours included several SEAL Teams, commander of the Special Operations Task Unit in western Iraq, and Operations Officer and Mission Commander for the U.S. Navy’s undersea special operations command.  From his time as a SEAL, he has extensive combat and leadership experience.  Eggers also served as the National Security Council’s Senior Director for Afghanistan and Pakistan for four years.

Kevin Lacz: Kevin “Dauber” Lacz is a United States Navy SEAL veteran who served two tours in the Iraq War with SEAL Team 3.  His platoon's 2006 deployment to Ramadi has been discussed in several books, including Dick Couch’s "The Sheriff of Ramadi", Jim DeFelice’s "Code Name: Johnny Walker", and Chris Kyle's New York Times best-selling autobiography, "American Sniper".  Lacz’s presence in the book led to his involvement in the production of and eventual casting in the Clint Eastwood-directed Oscar-winning biopic of the same name (starring Bradley Cooper).

Patchogue-Medford High School: Patchogue-Medford High School (colloquially Pat-Med) is a public high school in Medford, New York, which is located in Suffolk County, Long Island, in the United States.  The school is part of Patchogue-Medford School District.  The campus was renamed "Navy (SEAL) LT Michael P. Murphy Campus" after the US NAVY SEAL, Michael P. Murphy.

Chris Kyle: Christopher Scott "Chris" Kyle (April 8, 1974 – February 2, 2013) was a United States Navy SEAL veteran and sniper.  Kyle served four tours in the Iraq War and was awarded several commendations for acts of heroism and meritorious service in combat.  He was awarded one Silver Star Medal, four Bronze Star Medals with "V" devices, a Navy and Marine Corps Achievement Medal and numerous other unit and personal awards.

Jocko Willink: John "Jocko" Willink (September 8, 1971) is an American podcaster, author, martial artist and retired United States Navy SEAL.  He received the Silver Star and Bronze Star for his service in the Iraq War.  Willink was commander of SEAL Team Three's Task Unit Bruiser during the Battle of Ramadi.  Other notable members of Task Unit Bruiser included Leif Babin, Ryan Job, JP Dinnell, Marc Alan Lee, Michael Monsoor, Kevin Lacz and Chris Kyle.

Howard E. Wasdin: Dr. Howard E. Wasdin (born Howard E. Wilbanks on November 8, 1961) is a former member of the United States Navy who served as a sailor in the Atlantic Fleet as well as a Navy SEAL.  Following his honorable discharge, he co-wrote the autobiographical memoir "SEAL Team Six: Memoirs of an Elite Navy SEAL Sniper".  He also wrote "I Am a SEAL Team Six Warrior: Memoirs of an American Soldier".  Wasdin served in operation Desert Storm and was part of the operation to capture Mohamed Farrah Aidid, a Somalian warlord.  It was in the operation that Wasdin was shot and almost lost his leg.  After 12 years of service, he now lives in Georgia where he operates a chiropractic clinic.

Brandon Webb (author): Brandon Tyler Webb (born 1974) is a former United States Navy SEAL and SEAL Sniper Head Instructor, with one combat deployment to Afghanistan and one to Iraq.  He served as the Navy SEAL Sniper Course Manager, where he developed new curricula and trained snipers, including Chris Kyle.  He is the editor in chief of SOFREP and a media commentator on snipers and related Special Operations Forces military issues.  Webb is the co-author of "The 21st Century Sniper: A Complete Practical Guide".  He is the author of "The Red Circle", his memoir, and "The Making of a Navy Seal".

Canada and Iraq War resisters: During the Iraq War, which began with the 2003 invasion of Iraq, there were United States military personnel who refused to participate, or continue to participate, in that specific war.  Their refusal meant that they faced the possibility of punishment in the United States according to Article 85 of the US Uniform Code of Military Justice.  For that reason some of them chose to go to Canada as a place of refuge.  The choice of these US Iraq war resisters to go to Canada has led to considerable debate in Canada's society, press, legal arenas, and political arenas.  Much of the debate on this issue has been due to the controversial nature of the Iraq War itself.  Among the many elements of that debate are Canada's relationship to the Iraq war, and Canada's relationship to the US, its largest trading partner.

Supporting paragraphs: Taya Kyle Chris Kyle
Answer: four