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 aimed at maximizing penetration through thrusting; it could easily penetrate a G.I. steel helmet and liner with one thrust. Its thin, narrow design made it suitable primarily for combat use but was prone to breaking when used for other tasks like opening rations or ammunition.