John M. Christensen served in the 4th Infantry Regiment of the United States Army during the Philippine-American War. He served a three-year term, enlisting on December 12, 1898 and discharged December 11, 1901. He was appointed corporal on May 30, 1899 and promoted to sergeant on March 23, 1900.

The photograph album consists of candid photographs of life during the Philippine-American War. It includes photographs of Filipinos, American soldiers, buildings, a cock fight and scenery. The Soldier's Handbook includes handwritten notations on the clothing John received while in the Army.