Pedzisa mutsara unotevera: Gregory akabva asvika kuMarine Corps Base San Diego muna June 1927 uye akashanda somukuru wepositi kusvikira muna December 1928, paakaenda kunzvimbo yake yechipiri yokushanyira muNicaragua. Akabatanidzwa kuChipiri Marine Brigade pasi paBrigadier General Logan Feland uye akashanda semubatsiri kune brigade quartermaster kusvikira aendeswa semukuru we "Guardia Nacional de Nicaragua". Achiri muchinzvimbo ichi, akabatsira mubasa rokuyamura maererano ne
kudengenyeka kwapasi paManagua muna March 1931 uye akarumbidzwa nomunyori weNavy neRed cross. Akagamuchira Nicaraguan Presidential Order of Merit neGoridhe nyeredzi uyewo Medal of Merit nesirivha nyeredzi nokuda kwebasa rake muNicaragua.