You must kill yourself to earn this ribbon. This is done easiest in Domination maps by performing one of the following tasks.

Stay very close to a charge that is set by you. Protect the charge while not in Bleed Out mode and one suicide down.
Launch an explosive or throw a grenade in front of you. This is best done in a corner.
While on defense, repair a gate or motor pool where it spawns while alone and the APC is already destroyed.