I noticed these cocoons in the soil on the edge of my property. They're shallow, sometimes just on the surface between bricks and cement curb or the house. They're always in the  soil and up against something. I tried to ID by searching online but didn't find anything substantial. Is this an army worm pupa? I do not have any Brassica plants in the garden nor have I seen anything that looks like army worms. If it is army worms where would they be (eating under ground) and what plants would experience their suppression especially since I don't have any Brassica plants? I do have thistle, Trifolium pretense, blazing star, Echinacea, wild indigo, st John's wort, monadrda. Should I be concerned? I also found one in a bloodroot pot.