Bird Identification: CLOSED: Nuthatch?, 1 by ChirpChirp

ChirpChirp wrote:
I saw this bird today whilst working through a forest and not far from a large pond, at first I thought it was possibly a red-breasted nuthatch due to the black crown and black stripe through the eye, however it was more of an olive-drab color than the normal nuthatch coloring so I'm thinking it may be another bird, but I just can't figure out what.

Any help with the ID greatly appreciated as always. If needed I have a couple more pictures of it.