One of the RAF men peruses his papers, then steps into a small guardhouse and stirs the crank on a telephone. Waterhouse stands there awkwardly, marveling at the weapons slung from the shoulders of the RAP men. They are, as far as he can tell, nothing more than steel pipes with a trigger mounted toward one end. A small window cut through the pipe provides a view of a coil spring nested inside. A few handles and fittings bolted on from place to place do not make the Sten gun look any less like an ill-conceived high school metal shop project.