This Monday is Memorial Day, when many of us will spend a nice long weekend with our families hanging out at the beach, having a picnic in the park, or grilling in the backyard. School's almost out and summer's almost here. Sometimes in all the fun, it's easy to forget why we have this weekend in the first place -- because so many of the ones we love are not here to enjoy it.Memorial Day began after the U.S. Civil War to honor the ...