dirt Navy
n.— «I’m not likely to end up back on a ship anytime soon (if ever).…You could say I’ve gone from the “blue-water” Navy to the “dirt” Navy—or the “sand” Navy in this case.» —“Looks like I’m goin’ to the Gulf for a Year…“ by An ex-Squid FirstOnes.com Forums Dec. 19, 2005. (source: Double-Tongued Dictionary)