THRUSTER • DICTIONARY ONE.COM • Definition of Thruster

... almost unique knowledge of the army, was a deliberate, cautious Scot; he was the very last man to shirk responsibility and to shelter himself behind somebody else, but, on the other hand, he was not an impatient thruster who would be panting to be—in gunner's parlance—"re-teaming the battery before the old major was out of the gate." He accepted, and he was indeed bound to accept, the ideas of a predecessor of the highest standing in the Service, who had made a special study of campaigning possibilities ...

— Experiences of a Dug-out, 1914-1918 • Charles Edward Callwell