As of Tuesday, April 22, 2014, at least 2,177 members of the U.S. military had died in Afghanistan.
The world-famous boy band One Direction sent a special video message to Arapahoe High School shooting victim Claire Davis.
The video was posted on YouTube Thursday.
"Speical (sic) message to Claire from 1Direction Thank you every one(sic) for your support and thank you 1Direction, keep praying for her," the caption reads.
Scroll down to watch the video, or click here: https://www.youtube.com/watch?v=pXwknRI1vjg
On Twitter, friends have been using the #Get1DtoClaire hashtag to encourage Claire's favorite band to come to Colorado to visit her.
They also set up a Twitter account called Pray for Claire D.
17-year-old Claire Davis was shot in the head at point-blank range at the school on Friday, Arapahoe County Sheriff Grayson Robinson said.
As of Wednesday, Davis remained in a coma in critical condition.
Coverage: Arapahoe High School Shooting
Students returned to classes at Arapahoe High School on Tuesday.
Teachers and staff went back to work at Arapahoe High School on Monday. Students will return to classes on Tuesday.
An online petition drive is asking Littleton Public Schools to give Arapahoe High School shooting victim Claire Davis a diploma at graduation in May.
When an armed student went into Arapahoe High School on December 13, many people sprung into action.
Claire Davis' father asked people to forgive the fellow student who shot and killed his 17-year-old daughter at Arapahoe High School.
The Arapahoe High School shooter entered the school through a door that should have been closed and locked, but was left ajar, Arapahoe County Sheriff Grayson Robinson said.
Gov. John Hickenlooper orders flags lowered to half-staff Wednesday in honor of Claire Davis, the student slain in the Arapahoe High School shooting.
Tickets to the celebration of Claire Davis' life are now available for students and staff at Arapahoe High School.
Claire Davis will be celebrated next week with a memorial at the National Western Stock Show and Complex.