On the street, a blade under 3 inches should be legal in DC, so all of those sound OK. Getting into places is a different story. Federal facilities generally allow blades under 2.5 inches, but that rules out most of what you have, and I wouldn't want to try to negotiate a security checkpoint with multiple blades. Some places may not allow any blades (especially the White House, for instance). If the museum is the one place you are likely to go, you can call them and find out what their policy is.<br><br>If you don't want any hassles and you want to go anywhere you feel like and you really want a knife, I recommend taking one blade below 2.5 inches in length that is cheap enough that you don't mind losing it at a security checkpoint if necessary.