The product is a Vietnam Era Mobile Construction Battalion MCB-40 Navy Cruise Book from 1970. This collectible item provides a glimpse into the history and activities of the Navy during the Vietnam War. As an original period item, it holds significance in the militaria theme, offering a unique perspective on the experiences of military personnel during this tumultuous era. Made in Vietnam, this cruise book serves as a tangible piece of history that can be cherished and preserved for future generations to learn from and remember.