According to the Trib, a Joint Base Lewis-McChord soldier currently serving in Afghanistan has been arrested for using Facebook to solicit and distribute child pornography.

A Joint Base Lewis-McChord soldier is under investigation for using Facebook to allegedly solicit photos and videos of 10 Pierce County teenage girls in various stages of undress, then threatening to blackmail the girls if they didn't send more images. 
The 24-year-old soldier, who has not been identified by law-enforcement officials, allegedly began his activities some 10 months ago while stationed at Lewis-McChord and continued them in Afghanistan, where he is currently deployed. 
The soldier allegedly released some of the images online. The investigation, headed by the Washington State Patrol Missing and Exploited Children's Task Force, is focused on distribution of child pornography, blackmail and extortion, said Lt. Ron Mead of the State Patrol.

As the story says, it seems like a lot of problem soldiers have been associated with JBLM.  It's not clear whether there's something about the base itself, problems with recycling soldiers through too many deployments, or maybe some combination.