text:  After a series of stops, restarts, and repairs, the U.S.-built pier that leads into Gaza is operational again, and the U.S. troops overseeing aid delivery say they're doing what they can to get much-needed aid in. Seeing the destruction in Gaza makes you realize how important these humanitarian missions are, and you can also feel on this pier just how unstable it can be in rough seas. We can feel every time there is a swell, and you hear the clanking of the parts below me. ABC's Martha Raddatz.