National security adviser H.R. McMaster showed President Trump a black-and-white photo of Afghan women in miniskirts from 1972 in an effort to convince him to keep U.S. forces in Afghanistan, according to The Washington Post.

The photo was meant to show that Western culture had once flourished in the country and that they could once again with new U.S. efforts against the Taliban, the Post reported.

To convince Trump that Afghanistan was not lost cause, McMaster showed him 1972 photo of Afghan women in miniskirts. https://t.co/wRpwYoawjA pic.twitter.com/rX7S2jEJfA — Jim Roberts (@nycjim) August 22, 2017

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The black-and-white photo was just one element in the effort that McMaster and other members of the national security team made to convince Trump to keep U.S. forces in Afghanistan, despite his campaign promises to remove them.

Trump announced Monday evening that he would not be pulling U.S. troops from Afghanistan as part of a new strategy he insisted would win the longest military conflict in U.S. history.

Trump’s decision was seen as a victory for McMaster and Defense Secretary James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE, who warned Trump that Afghanistan could revert to a breeding ground for terrorism if U.S. forces were pulled from the country.

Trump did not give details on how many troops would be added or any timetables on when they would be deployed, though it is expected between 3,000 and 5,000 new troops will be added to the 8,400 now in the country under the strategy outlined on Monday night.

"The American people are weary of war without victory. I share the American people’s frustration," Trump said. “In the end, we will fight and we will win.”