dirt Navy
n.β Β«Iβm not likely to end up back on a ship anytime soon (if ever).…You could say Iβve gone from the “blue-water” Navy to the “dirt” Navyβor the “sand” Navy in this case.Β» ββLooks like Iβm goinβ to the Gulf for a Year…β by An ex-Squid FirstOnes.com Forums Dec. 19, 2005. (source: Double-Tongued Dictionary)