What grenade is shaped like a baseball?

The M-67 Fragmentation Grenade is correctly identified as being shaped like a baseball. This design is intentional, as the round shape allows for a more aerodynamically favorable profile when thrown. The M-67 is designed to create a lethal blast radius by using a fragmentation pattern that effectively disperses shrapnel in a wide area, making it a key tactical weapon for infantry units. The textured surface of the grenade also aids in gripping it securely during handling and throwing.

In contrast, other options do not share this distinguishing physical feature. The M-18 Smoke Grenade has a cylindrical shape and is often used to produce smoke for signaling or obscuring vision. The M-203 Grenade Launcher is not a grenade itself; rather, it is a weapon designed to launch grenades. The term "Hand Grenade" can refer to different types of grenades, but in the context of distinguishing features, the M-67 specifically matches the baseball shape description among standard military grenades.