What does USO stand for?

Unidentified Submarine Object

This definition appears very rarely

Other Resources:

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United States National Team Development Program (hockey) United States National Taekwondo Federation United States Naval Test Pilot School United States Naval Training Station United States National Vegetation Classification University of the State of New York University Sport New Zealand Ultra Stable Oscillator Undercover Special Operations Unidentified Sliding Object (vehicle)		Unidentified Submersible Object Unidentified Superconducting Object Unilateral Salpingo-Oophorectomy (surgical procedure) Unión Sindical Obrera (Spanish: Workers Syndical Union; Spain) Union Sportive Orléans (French sports organization) Union Sportive Oyonnax (French sports organization) Unique Sink Orientation Unit Security Officer United Service Organizations (provides morale, welfare and recreation-type services to US uniformed military personnel) United Solar Ovonic (various locations)