Title: 2002 Winter Olympics opening ceremony
Content:  attention and saluted the flag. The Mormon Tabernacle Choir, clad in white sweaters, performed "The Star-Spangled Banner", the US national anthem, as the flag (the Challenger flag) was raised. The parade of the 2,300 athletes was led by the Child of Light and began traditionally with Greece and ending with the host nation, the United States of America. As the artistic section kicked off, the five native Utah Native American tribes arrived together on horseback and performed several traditional "Welcome" stomp dances. Robbie Robertson performed during this segment. It was reported that the IOC had rejected a proposal by the USOC to have its flagbearer carry the Ground Zero flag during 
Title: 1996 Summer Olympics opening ceremony
Content:  Following the Call to the Nations, the first official protocol of the ceremony took place. This called for the head of state to make his or her entrance. In this case the head of state was Bill Clinton, the 42nd President of the United States. He was joined by Atlanta Committee for the Olympic Games President Billy Payne and IOC President Juan Antonio Samaranch. After the presentation of colors, the American flag was raised while the Centennial Olympic choir sung the national anthem which was The Star-Spangled Banner. A fly-by from the USAF Thunderbirds concluded the segment.
Title: List of flag bearers for the United States at the Olympics
Content:  This is a list of flag bearers who have represented United States at the Olympics. Flag bearers carry the national flag of their country at the opening ceremony and closing ceremony of the Olympic Games. Men and women from across the country and from a variety of sports have carried the flag at both the Summer Olympic Games and the Winter Olympic Games. More than half of those representing the teams at the Summer Olympics are track or field athletes, though that sport does account for the most competitors at the Games. James Bickford, Norman Armitage, and Pat McDonald have all performed the duty twice. Several athletes born in other countries have carried the flag, including those from Norway, Ireland, Sudan, Germany, and Czechoslovakia.
Title: 2012 Summer Paralympics opening ceremony
Content:  Queen Elizabeth II and Sir Philip Craven entered the stadium, after they were seated the Union Flag was raised and the national anthem of the United Kingdom was played. Corporal of the Horse Brophy – The Household Cavalry Mounted Division; Lance Corporal Steane – Nijmegen Company, Grenadier Guards; Warrant Officer Vaughan – RM Poole; Chief Petty Officer Appleton – HMS Raleigh; Leading Hand Campbell – HMS Coniston; Warrant Officer Grundy – RAF Cranwell; Sergeant Hyde – RAF Valley; Lance Corporal O'Mahoney – The Household Cavalry Mounted Division; marched the flag to the flag pole under the leadership of Flight Lieutenant Marsden – RAF Halton. As they marched William Walton's "A Wartime Sketchbook" was heard. The flag was raised to the national anthem by Able Seaman Patel – HMS King Alfred; Corporal Penman – RAF Lossiemouth; Lance Corporal Peelo as a 430 strong choir performed the song and 12 people signed the song. Whilst the umbrellas in the centre of the stadium formed a representation of the flag.
Title: 2004 Summer Olympics Parade of Nations
Content:  During the Parade of Nations portion of the 2004 Summer Olympics opening ceremony, athletes from each country participating in the Olympics paraded in the arena, preceded by their flag. The flag was borne by a sportsperson from that country chosen either by the National Olympic Committee or by the athletes themselves to represent their country.
Title: 1984 Summer Olympics opening ceremony
Content:  John Williams performed his dedicated theme to the games, "Olympic Fanfare and Theme". Volunteer performers entered the stadium, marching with white Olympic flags. They formed the 1984 Olympic logo, as well as the "Stars in Motion" outline on the field. The Antwerp flag was then presented to Los Angeles Mayor Tom Bradley, as Bradley had not been present at the closing ceremonies of the 1980 Summer Olympics in Moscow four years earlier. The parade of 140 National Olympic Committees began with Greece, as per tradition. Speeches were then made by Los Angeles Olympic Organizing Committee president Peter Ueberroth and IOC president Samaranch. For the first time, a sitting U.S. president opened the games in person, as President Reagan declared the competition officially open. The Olympic flag entered the stadium, and an instrumental version of the Olympic Hymn was played. Afterward, homing pigeons were released.
Title: 2010 Winter Paralympics opening ceremony
Content:  The flag was carried into the stadium. It was then transferred to members of the Canadian Forces' Soldier On program: Sgt. Karen McCoy, and Master Cpl. Mike Trauner, who then raised the flag.
Title: 2012 Summer Olympics opening ceremony
Content:  Shami Chakrabarti (for "her integrity"), Daniel Barenboim (for bringing "harmony in place of discord"), and Marina Silva (as UN Champion of the Earth). The flag paused in front of Muhammad Ali (invited to represent 'respect, confidence, conviction, dedication, generosity and spiritual strength'), who held it for a few moments. The flag was received by a colour guard of Her Majesty's Armed Forces and hoisted to the Olympic Hymn, performed by the LSO and the Grimethorpe Colliery Band. A brief reprise of "And I will Kiss" commenced the Olympic Oaths, taken by taekwondo athlete Sarah Stevenson on behalf of the athletes, by British AIBA Referee Mik Basi on behalf of the officials, and by Eric Farrell on behalf of the coaches.
Title: 1984 Winter Olympics national flag bearers
Content:  During the Parade of Nations section of the 1984 Winter Olympics opening ceremony, athletes from the participating countries marched into the arena. Each delegation was led by a flag bearer and a sign with the name of the country on it. The Parade of Nations was organized in Serbo-Croatian, the official language in Yugoslavia. As tradition dictates, Greece led the parade and Yugoslavia was the last to march to the stadium as the host nation. Two nations were unable to march with their respective national flags, namely British Virgin Islands and Chinese Taipei. While Chinese Taipei was unable to use their flag and the name "Republic of China" due to participation of People's Republic of China, British Virgin Islands team was forced to use a replacement flag. The replacement flag is a white-colored cloth with the words “B. Djevičanska Ostrva” in blue color and the Olympic Rings on it. The organizers were unable to create the flag and created the replacement flag for the opening ceremony.
Title: 2012 Summer Olympics closing ceremony
Content:  The section began with the Greek national anthem being played and raising of the flag; followed by the Olympic anthem and the lowering of the flag. The Mayor of London, Boris Johnson, then handed the Olympic flag to Jacques Rogge, who in turn passed it to Eduardo Paes, the Mayor of Rio de Janeiro. This was followed by the Brazilian national anthem and raising of the flag. The Olympic flag was raised again in Sochi, Russia, on 7 February 2014 at the opening ceremony of the 2014 Winter Olympics.

Question: who carried the usa flag in opening ceremony?
Answer: Erin Hamlin.