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Walter Bruce Willis was born on March 19, 1955, in the town of Idar-Oberstein, West Germany. His father, David Willis, was an American soldier. His mother, Marlene, was German, born in Kassel. Willis is the oldest of four children with a sister named Florence and two brothers, Robert (who is deceased) and David.

Throughout his film career, Willis has depicted several military characters in films such as In Country, The Siege, Hart's War, Tears of the Sun, Grindhouse, and G.I. Joe: Retaliation. Growing up in a military family, Willis has publicly sold Girl Scout cookies for the United States armed forces. In 2002, Willis's then 8-year-old daughter, Tallulah, suggested that he purchase Girl Scout cookies to send to troops. Willis purchased 12,000 boxes of cookies, and they were distributed to sailors aboard USS John F. Kennedy and other troops stationed throughout the Middle East at the time.  In 2003, Willis visited Iraq as part of the USO tour, singing to the troops with his band, The Accelerators. Willis considered joining the military to help fight the second Iraq war, but was deterred by his age. It was believed he offered $1 million to any noncombatant who turns in terrorist leaders Osama bin Laden, Ayman al-Zawahiri, or Abu Musab al-Zarqawi; in the June 2007 issue of Vanity Fair, however, he clarified that the statement was made hypothetically and not meant to be taken literally. Willis has also criticized the media for its coverage of the war, complaining that the press were more likely to focus on the negative aspects of the war:  I went to Iraq because what I saw when I was over there was soldiers--young kids for the most part--helping people in Iraq; helping getting the power turned back on, helping get hospitals open, helping get the water turned back on and you don't hear any of that on the news. You hear, 'X number of people were killed today,' which I think does a huge disservice. It's like spitting on these young men and women who are over there fighting to help this country.  Willis stated in 2005 that he wanted to "make a pro-war film in which American soldiers will be depicted as brave fighters for freedom and democracy." The film would follow members of Deuce Four, the 1st Battalion, 24th Infantry, who spent considerable time in Mosul and were decorated heavily for it. The film is to be based on the writings of blogger Michael Yon, a former United States Army Special Forces soldier who was embedded with Deuce Four and sent regular dispatches about their activities. Willis described the plot of the film as "these guys who do what they are asked for very little money to defend and fight for what they consider to be freedom."
Bruce Willis