shiny silver object, spherical at a standstill and vertical speeds that boggle the mind.while on duty in Bosnia I and others including a maintenance test pilot for AH-64 Attack helicopters observed a sphere or the bottom of large disc object at approx. 2500 ft agl. I told them to look up and at that time I took pictures with my cannon ae-1 camera. We could hear jet acft coming hard on our position at full speed. the sphere then just ascended strait up. The jets were in full afterburner as we could see the exhaust. The jets circled for a few moments as the object was gone by then. They continued circling for a few moments and then throttled down and went away. I was relieved of my film by personell who had no rank or unit patches. We chalked it up to spook ops. I know what we saw. it wasn't ours or their's.((NUFORC Note: Witness indicates that date of incident is approximate. PD))