OMN http://api.nsgreg.nga.mil/geo-political/GENC/3/3-19 urn:us:gov:dod:nga:def:geo-political:GENC:3:3-19 geo-political:GENC:3:3-19 ge:GENC:3:3-19 OM http://api.nsgreg.nga.mil/geo-political/GENC/2/3-19 urn:us:gov:dod:nga:def:geo-political:GENC:2:3-19 geo-political:GENC:2:3-19 ge:GENC:2:3-19 512 http://api.nsgreg.nga.mil/geo-political/GENC/n/3-19 urn:us:gov:dod:nga:def:geo-political:GENC:n:3-19 geo-political:GENC:n:3-19 ge:GENC:n:3-19 exception 2023-07-01 unchanged independent OM-BJ OM-BS OM-BU OM-DA OM-MA OM-MU OM-SJ OM-SS OM-WU OM-ZA OM-ZU ara