Lieutenant Commander Hass enlisted in the Navy in July 1989, attending recruit training at Recruit Training Center, Orlando FL, where he served as the Recruit Chief Petty Officer. After graduating as Class Leader and Honor Graduate from Builder "A" School Gulfport, Mississippi, he reported to Naval Mobile Construction Battalion ONE THIRTY THREE. Following his battalion tour he was ordered to Naval Support Facility, Thurmont, Maryland for Presidential Support Duty as the Presidential Builder. His next orders were to attend Builder "C" school and report to Naval Mobile Construction Battalion SEVEN.
While assigned to SEVEN he attended Construction Inspector "C" School in Gulfport, Mississippi, and Infantry Mortar Leadership course and Advanced Infantry Training in Fort Benning, Georgia. His tour with SEVEN proved to be very challenging and rewarding. He held a variety of jobs during his four deployments. His job assignments were Project Supervisor, Charlie Company Operations Chief, Air Det Operations Chief, Quality Control Chief, and Material Liaison Officer. Additionally, he was awarded 1997 Sailor of the Year for Naval Mobile Construction Battalion SEVEN; Construction Battalion Center Gulfport, Mississippi; Second Naval Construction Brigade; and CINCLANTFLT direct reporting activities. In 1998 he was awarded the Marvin Shields Award.
In September 1999 he was promoted to Builder Chief and in 2001 he accepted a commission to Ensign as a Limited Duty Officer. In December 2001 LCDR Hass reported for duty as the Officer-in-Charge of Construction Battalion Unit FOUR ONE TWO, Kings Bay, Georgia where he deployed to Iraq in support of Operation Iraqi Freedom with the 1st Marine Expeditionary Force as Public Works Officer for Fleet Hospital THREE. Upon his return from Iraq he was ordered to Naval Mobile Construction Battalion FORTY where he served as Assistant Operations Officer, Training Officer, Intelligence Officer, and Charlie Company Commander. In December 2005 Lieutenant Commander Hass reported to CECOS as a Construction Battalion Operations Instructor and Assistant Department Head. In November 2007 LCDR Hass reported for duty as the 31st Seabee Readiness Group in Port Hueneme, CA as the Assistant Training Officer, and Contingency Operations Readiness Training Officer. In July 2009 he was ordered to 7th Naval Construction Regiment as the Training and Readiness officer, in May 2011 he fleeted up as the Chief Staff Officer until his transfer in April 2012 as the Public Works Officer to Naval Air Station, Kingsville, TX.