Oops:

A Camp Hansen Marine was arrested last week after a bullet was found in his bag at Naha Airport, Japanese police said.

Cpl. Aaron Swicegood, 25, was taken into custody at a domestic terminal security checkpoint at approximately 9:20 a.m. Friday after a live pistol round was found in his rucksack, a Tamashiro police spokesman said. Swicegood was traveling to Tokyo on his way to Los Angeles.  [Stars & Stripes]

You can read more at the link, but this is a good reminder to make sure to check every small pocket in your bags for contraband to avoid an incident like this.