Answer:
You can spin, wheel and twist. But this thing can turn without moving.
Soldiers line up spaced with pride. Two long rows lined side by side. One sole unit can decide, if the rows will unite or divide.
Two in a whole and four in a pair. And six in a trio you see. And eight's a quartet but what you must get. Is the name that fits just one of me?
Slayer of regrets, old and new, sought by many, found by few.
We travel much, yet prisoners are, and close confined to boot. Yet with any horse, we will keep the pace, and will always go on foot.
Special abilities and brightly colored underwear are all you need to be one of these.