S-Mines, or as they are better known, Bouncing Betties are an explosive device in Battlefield Vietnam. The S-mine was first developed in Germany and produced from 1935 onwards. It was used in WWII, after which it was copied and used by a lot of nations, including the Soviet Union, the USA, China, Finland and others.
After being triggered, the Bouncing Betty is propelled into the air, after which it detonates, sending out hundreds of metal balls. Thanks to this process, it had a 20 meter lethal radius and a 100 meter injure radius.
The Bouncing Betty is issued as an option to the NVA and Vietcong Scout 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 flags 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.