The narrower V-42 stiletto blade profile was designed to optimize penetration on thrusting; it could easily penetrate a G.I. steel helmet and liner with a single thrust. With its relatively thin, narrow blade, the V-42 was designed from the outset for use as a fighting knife, and was prone to breakage when used for utility chores such as opening ration tins or ammunition crates.
The V-42 stiletto blade profile was crafted to maximize penetration through thrusting; it could effortlessly pierce a G.I. steel helmet and liner with one thrust. With its thin, narrow blade, the V-42 was initially intended as a combat knife but was prone to breaking when used for tasks like opening rations or ammunition.