For each of datums 6182 and 6616, CRSs 4182 and 4616 and transformation 1965, added two US DMA/NIMA/NGA alternative identifiers as aliases, with alias remarks. For projCRSs 2188 and 2943, added US DMA/NIMA/NGA alternative identifier as alias, with alias remarks. For tfm 1887 amended existing US DMA/NIMA/NGA alternative identifier from "Observatario Meteorologico to WGS 84" to "Observatorio Meteorologico 1939 to WGS 84 (1)" and added remarks; added second US DMA/NIMA/NGA alternative identifier "Observatorio 1966 to WGS 84 (1)" with remarks.