High speed! Very colorful, chased by military helicopters a few minutes later.Bloomington, UT. Heading opposite direction from Walmart. Strong sulfur smell at Walmart, enough to cover mouth/nose. Other people in parking lot didn't seem to notice. Start driving home. We noticed this craft, some what round, other person thought it was a helicopter for a little while until it moved fast! It was probably 70ft in the air then headed away from our car and over this huge hill that was a good 2 minute drive away in a few seconds. The actual ufo was brightly colored. It had orange, red, white and green. I remember orange the most. No lights blinked. I tried to record it on my phone but I couldn't get any resolution to actually see the craft. So we get home and maybe 1 minute later a helicopter zooms by, I heard the first one and while I was looking up any local ufo sightings. I then heard a second helicopter and ran out front to see where it was heading. The second helicopter was solid black with some dull green lights on the bottom. Turns out! Both copters were heading the same direction as the colorful craft, I mean directly where the colorful thing went. The black helicopter was only 40-50ft above my head when I saw it. I'm thinking military as far as style goes. I couldn't tell what the other copter looked like.