US President Barack Obama waves after addressing troops at the RAAF base in Darwin, Australia, on 17 November 2011. President Obama praised Australian troops as among the toughest in the world as a rapturous send-off from Darwin capped off his whirlwind Australian visit. EPA/SCOTT BARBOUR / POOL
US President Barack Obama waves as he leaves after addressing the troops at the RAAF base in Darwin, Australia, on 17 November 2011. President Obama praised Australian troops as among the toughest in the world as a rapturous send-off from Darwin capped off his whirlwind Australian visit. EPA/SCOTT BARBOUR / POOL
Australian Prime Minister Julia Gillard addresses the troops as US President Barack Obama looks on at the RAAF base in Darwin, Australia, on 17 November 2011. President Obama praised Australian troops as among the toughest in the world as a rapturous send-off from Darwin capped off his whirlwind Australian visit. EPA/SCOTT BARBOUR / POOL
US President Barack Obama and Australian Prime Minister Julia Gillard arrive to address the troops at the RAAF base in Darwin, Australia, on 17 November 2011. President Obama praised Australian troops as among the toughest in the world as a rapturous send-off from Darwin capped off his whirlwind Australian visit. EPA/SCOTT BARBOUR / POOL
US President Barack Obama addresses the troops as Australian Prime Minister Julia Gillard applauds at the RAAF base in Darwin, Australia, on 17 November 2011. President Obama praised Australian troops as among the toughest in the world as a rapturous send-off from Darwin capped off his whirlwind Australian visit. EPA/SCOTT BARBOUR / POOL
US President Barack Obama looks on as Australian Prime Minister Julia Gillard addresses the troops at the RAAF base in Darwin, Australia, on 17 November 2011. President Obama praised Australian troops as among the toughest in the world as a rapturous send-off from Darwin capped off his whirlwind Australian visit. EPA/SCOTT BARBOUR / POOL
US President Barack Obama and Australian Prime Minister Julia Gillard pose for photos after addressing the troops at the RAAF base in Darwin, Australia, on 17 November 2011. President Obama praised Australian troops as among the toughest in the world as a rapturous send-off from Darwin capped off his whirlwind Australian visit. EPA/SCOTT BARBOUR / POOL
Troops look on as US President Barack Obama and Australian Prime Minister Julia Gillard (unseen) address them at the RAAF base in Darwin, Australia, on 17 November 2011. President Obama praised Australian troops as among the toughest in the world as a rapturous send-off from Darwin capped off his whirlwind Australian visit. EPA/SCOTT BARBOUR / POOL
US President Barack Obama addresses the troops as Australian Prime Minister Julia Gillard applauds at the RAAF base in Darwin, Australia, on 17 November 2011. President Obama praised Australian troops as among the toughest in the world as a rapturous send-off from Darwin capped off his whirlwind Australian visit. EPA/SCOTT BARBOUR / POOL
US President Barack Obama addresses the troops as Australian Prime Minister Julia Gillard looks on at the RAAF base in Darwin, Australia, on 17 November 2011. President Obama praised Australian troops as among the toughest in the world as a rapturous send-off from Darwin capped off his whirlwind Australian visit. EPA/SCOTT BARBOUR / POOL
US President Barack Obama looks on as Australian Prime Minister Julia Gillard addresses the troops at the RAAF base in Darwin, Australia, on 17 November 2011. President Obama praised Australian troops as among the toughest in the world as a rapturous send-off from Darwin capped off his whirlwind Australian visit. EPA/SCOTT BARBOUR / POOL
US President Barack Obama and Australian Prime Minister Julia Gillard shake hands with the troops at the RAAF base in Darwin, Australia, on 17 November 2011. President Obama praised Australian troops as among the toughest in the world as a rapturous send-off from Darwin capped off his whirlwind Australian visit. EPA/SCOTT BARBOUR / POOL
US President Barack Obama addresses the troops as Australian Prime Minister Julia Gillard looks on at the RAAF base in Darwin, Australia, on 17 November 2011. President Obama praised Australian troops as among the toughest in the world as a rapturous send-off from Darwin capped off his whirlwind Australian visit. EPA/SCOTT BARBOUR / POOL
US President Barack Obama addresses the troops as Australian Prime Minister Julia Gillard applauds at the RAAF base in Darwin, Australia, on 17 November 2011. President Obama praised Australian troops as among the toughest in the world as a rapturous send-off from Darwin capped off his whirlwind Australian visit. EPA/SCOTT BARBOUR / POOL
Troops look on as US President Barack Obama addresses them at the RAAF base in Darwin, Australia, on 17 November 2011. President Obama praised Australian troops as among the toughest in the world as a rapturous send-off from Darwin capped off his whirlwind Australian visit. EPA/SCOTT BARBOUR / POOL
US President Barack Obama smiles before addressing troops at the RAAF base in Darwin, Australia, on 17 November 2011. President Obama praised Australian troops as among the toughest in the world as a rapturous send-off from Darwin capped off his whirlwind Australian visit. EPA/SCOTT BARBOUR / POOL
US President Barack Obama waves after addressing troops at the RAAF base in Darwin, Australia, on 17 November 2011. President Obama praised Australian troops as among the toughest in the world as a rapturous send-off from Darwin capped off his whirlwind Australian visit. EPA/SCOTT BARBOUR / POOL
US President Barack Obama arrives at the RAAF base in Darwin, Australia, on 17 November 2011. While in Australia, Mr Obama has announced an increase in the number of US troops to be stationed in Darwin. EPA/MICHAEL FRANCHI / POOL
US President Barack Obama smiles before addressing troops at the RAAF base in Darwin, Australia, on 17 November 2011. President Obama praised Australian troops as among the toughest in the world as a rapturous send-off from Darwin capped off his whirlwind Australian visit. EPA/SCOTT BARBOUR / POOL
US President Barack Obama is greeted by Australian Prime Minister Julia Gillard as he arrives at the RAAF base in Darwin, Australia, on 17 November 2011. While in Australia, Mr Obama has announced an increase in the number of US troops to be stationed in Darwin. EPA/MICHAEL FRANCHI / POOL
US President Barack Obama (C) is greeted by the US Consular General Frank Urbancic (2-L) and Larrrakia Indigenous Elder William Risk (L) as he arrives while Northern Territory Chief Minister Paul Henderson, the Australian Prime Minister Julia Gillard, Northern Territory Administrator Sally Thomas wait on at the RAAF base in Darwin, Australia, on 17 November 2011. While in Australia, Mr Obama has announced an increase in the number of US troops to be stationed in Darwin. EPA/MICHAEL FRANCHI / POOL
US President Barack Obama is greeted by Australian Prime Minister Julia Gillard (C) along with Northern Territory Administrator, Sally Thomas and Chief Minsiter, Paul Henderson (2-L) as he arrives at the RAAF base in Darwin, Australia, on 17 November 2011. While in Australia, Mr Obama has announced an increase in the number of US troops to be stationed in Darwin. EPA/MICHAEL FRANCHI / POOL
US President Barack Obama (C) is greeted by Larrrakia Indigenous Elder, William Risk as the Australian Prime Minister Julia Gillard, the US Consular General, Frank Urbancic (obscured) and Northern Territory Chief Minister Paul Henderson (R) look on at the RAAF base in Darwin, Australia, on 17 November 2011. While in Australia, Mr Obama has announced an increase in the number of US troops to be stationed in Darwin. EPA/MICHAEL FRANCHI / POOL
Australian Prime Minister Julia Gillard (L) with Northern Territory Chief Minister Paul Henderson walk on the tarmac for the arrival of US President Barack Obama in Darwin, Australia, on 17 November 2011. While in Australia Mr Obama has announced an increase in the number of US troops to be stationed in Darwin. EPA/MICHAEL FRANCHI / POOL
US President Barack Obama and Australian Prime Minister Julia Gillard attach messages to wreaths placed at the memorial of the USS Peary in Darwin, Australia, on 17 November 2011. Riley Wing survived the Darwin bombing by Japanese aircraft which resulted in the sinking of the Peary, a Clemson-class destroyer, on February 19, 1942. EPA/PAUL MILLER
