turtle
n.— «In soldier parlance, they are “turtles”—a Vietnam-era nickname derived from their supposedly slow arrival in theater—or “FNGs,” a slightly more colorful reference to their “[expletive] New Guy” status.» —“Replacements joining units in Iraq finding they’ve got big shoes to fill” by Joseph Giordono in Ramadi, Iraq Stars & Stripes Feb. 6, 2005. (source: Double-Tongued Dictionary)