I was delighted to find many soldier orchids in the mulch at the north side of our home. They bloom in January and February then disappear. They may or may no reappear next year.
If they show up in your lawn, do not panic and spend no money eradicating them. They will disappear on their own. Maybe you will see them again next winter, maybe you will not. I hope that they will show up again in my yard.