This dusk photograph, taken from a 35mm color slide, shows a silhouetted serviceman standing watch atop a bunker or perimeter revetment, likely near Cam Ranh Bay, one of the largest U.S. military installations in South Vietnam during the Vietnam War. Though the individual's identity and unit cannot be determined from the image, the scene is representative of the nightly perimeter security duties maintained at large American bases throughout the conflict. Project: 218443