SHIELD
Celeste a lozenge Or charged with an orle Gules voided per barry of five from the top Sable, Silver Gray, Light Blue, Yellow and Silver Gray between two lightning bolts pilewise Argent, on a chief wavy of the second a martlet of the third.
CREST
Issuing from a torse Or and Celeste flanking a headland Vert, two palm trees Proper, surmounted by canoe paddles in base per saltire Proper overall a latte stone Proper.
SUPPORTERS
To dexter a United States Navy officer sword, in sinister a Marine officer mameluke per saltire points downward Proper.
MOTTO
A Blue scroll triparted Light Blue edged and turned Navy Blue and inscribed "SWIFT AND BOLD" in White letters.
SEAL
The coat of arms as blazoned in full color upon a white oval enclosed by a dark blue collar edged on the outside with a gold rope and bearing the inscription "USNS GUAM" at top and "HST-1" at base in gold.
SHIELD
The colors of the shield, light blue and yellow, are the colors of the Military Sealift Command. The central image is taken from the flag of Guam and depicts a throwing stone; the bars of color in the middle are the stack colors of the Military Sealift Command fleet and reflect that USNS GUAM is part of that fleet. The lightning bolts represent speed and demonstrate that USNS GUAM is a high speed capable vessel. The wavy indicates that Guam is an island surrounded by the Pacific Ocean. The martlet is a mark of cadency signifying that this is the fourth seagoing vessel named after the island of Guam.
CREST
The headland and palm trees are taken from the flag of Guam and describe the tropical environment of the island. The paddles relate to the Chamorro legend of chief Gadao and his powerful paddling prowess. The latte stone is regarded as a symbol of tradition and strength and served as foundation blocks for the thatch huts of the pre-contact ancient Chamorros. They are found in many parks and jungle areas of Guam.
SUPPORTERS
The swords symbolize cooperation and teamwork between the U.S. Navy and U.S. Marine Corps and the capability to transport all branches of the military and their vehicles.