Which music video was the first in which Justin Bieber wore a military id, also called a dog tag?

Explanation

Justin's song "One Less Lonely Girl" was released on 6 October 2009. The song is found on his album "My World". The lines "I´m gonna put you first" and "I´ll show you what you´re worth" are both from this song. The music video was filmed in Watertown, Tennessee. This was the video in which Justin was first wearing a military id around his neck which later became his trademark. Whilst performing "One Less Lonely Girl", Justin always invites a girl to join him on stage and gives her flowers. He also surprises random girls with free concert tickets.