Remove a trajectory?

[Streetwise]

I have a file that has a group of objects that have no apparent keyframes, but rather, a trajectory. I don't want the object to animate in a circle, but can't figure out how to remove the animation from it. A second question is that all of the objects, when selected, can not be grouped. In fact, all menu items are greyed out except "Assembly". Not sure why.

[Streetwise]

Answered my own question sort of. I found that if I select the objects and hit "Unlink", that removed the animation trajectory plus it also allowed me to group everything together. I still can't figure out why I there's no evidence of a parent or anything that it must have been linked to.