Hi John, did you ever find more info about your Field family? Here's another site you may not have found yet...actually it's two sites for the same place:
1) Corozal American Cemetery-info, pix & video-http://www.abmc.gov/cemeteries/cemeteries/cz.php
2) Search for gravesites at Corozal - http://www.abmc.gov/search/cz_search.php
Also, all three of them are listed on Find A Grave - findagrave.com. Are you familiar with that wonderful website?
Hope this helps. Let me know how you are doing!