Another problem that frequently prevents us from bringing good knives is that Customs can really hassle us on the way back to the states.
When my unit redeployed to the states from Iraq, about 10% of us had to completely empty all bags in front of a customs agent, and if he found anything he didn't like, such as a folder over 3.5 inches, anything with a clip point or double edge, or anything spring loaded / spring assisted, they would confiscate them.
I had some knives that I wanted to bring with me at the time, but was worried about losing them on the way back in. Customs can pretty much operate with unilateral authority in these matters...so if they decide they want to take something you are screwed.