Rocket Leap is an alternate ability for the Foot Soldier's Rocket Jump. It was added in the Garden Variety DLC. Instead of launching the Foot Soldier at a great height, it launches it at a slightly lower height but at a very long forward distance. The Rocket Leap can be used two times without needing to recharge. It takes 30 seconds to recharge one Rocket Leap, 10 more seconds than the original ability.
What it lacks in height, the Rocket Leap makes up for in distance. It's a giant leap forward in Zomboss technology!