Military Issued Vietnamese Phrase Book

A book of “common” phrases issued to American soldiers stationed in Vietnam during the war, they were published to give to the soldiers to help them understand and have basic communication with locals they'd encounter; it also included military terms and their translations.  This one was published in 1962 (the war started in 1955 and ended in 1977), and was given to my grandfather when he arrived in Vietnam in 1969. He was stationed there for three years before discharged . He took this book, No. 20-611 back home with him.