On a blue horizontal rectangle arched convexly at top and bottom edged with a 1/8 inch (.32 cm) white border, a gray Latte stone fimbriated white between two yellow demi-horses counter-forcene attached above a blue scroll edged with a 1/8 inch (.32 cm) white border and inscribed "TINIAN" in yellow letters. Attached below the square a blue scroll edged with a 1/8 inch (.32 cm) white border and inscribed "HIGH SCHOOL" in yellow letters. The overall dimensions are 3 1/4 inches (8.26 cm) in height by 2 3/4 inches (6.99 cm) in width.
Gold, blue and white (silver) are the school colors. Latte stones were pillars of the house of Taga, the strongest man ever to live according to Marianas legend. The stones symbolize the strength of mind, body and character of the cadets. The stallion is the school mascot.
The shoulder sleeve insignia was approved on 24 November 1999.