The Bouncing Betty is a weapon featured in Battlefield Vietnam. It is issued as an option to the NVA and VietcongScout kit, along with a Type-56 carbine and a Time bomb, and is issued a total of 5. The Bouncing Betty is extremely useful in defending Control points and choke points, as they are small and easily concealable, and have the blast radius of a grenade. As in reality, it first launches into the air, after which it explodes in midair.
One downside is that they are also triggered by friendly players, meaning that, unless friendly fire is turned off, they can easily result in teamkills.
Because Battlefield Vietnam features different loadouts for each faction, this list may not be specific enough. Please see each faction's respective page for information on individual weapon kits and loadouts.