Rockville native Richard Martin was stationed at Pearl Harbor when it was attacked by Japanese aircraft on December 7, 1941, and photographed the carnage he witnessed. Some of Martin’s snapshots show the wreckage of a Japanese plane shot down during the raid. Beyond the photographs, Martin returned home with other souvenirs: a metal fragment from the grounded Japanese plane that day, and a piece of shrapnel that landed near Martin while he was sheltering beneath a tree. Years later, Martin reported that the Americans didn’t know what was happening – or would happen – during the attack, and expected Japanese troops to come ashore after the air raid. When the piece of shrapnel landed near him, he had been hiding behind the tree with his rifle, waiting and ready for advancing Japanese soldiers who never arrived.