US customs officials have retrieved a Vietnam war plaque missing for seven years, after raiding a shipment of military items bound for Thailand, officials said Wednesday.The memorial plaque, paying tribute to 19 prisoners of war and military personnel missing in action during the conflict, disappeared after being sent for re-polishing by its owners in 2004.It belonged to Americans Who Care, based in Fayetteville, Carolina, and was seized by customs officers in a shipment leaving the West Coast port of Long Beach, south of Los Angeles, on April 19."This discovery attests the attentiveness, vigilance...