Bonus crates are objects that appear in campaign missions. By cracking one of this crates open, you will receive a special reward, ranging from immediate veteran upgrades (+1 rank) to instant healing or even additional credits (up to +1000, depending on the unit that touches the crate -- the more powerful the unit, the better the bonus). However, do not order a unit to crack one of this crates more than once in a brief period of time or the value will drop. Unlike the previous game, Tiberian Sun, the crates will always be positive, and would explode or release Tiberium Vapor when cracked open. To crack one, order your unit to move over it.