I need a mechanical way to make my soldiers who are combat explorers in a forest to be able to jump higher than normal. They will be equipped with a variety of weapons from normal hand held weapons up to rocket launchers, and grenade launchers. Most soldiers will be armed with a normal rifle or smaller weapon platform plus a choice of light rocket launcher or a grenade launcher, not both. No soldier will have more than that weight wise other than reserve ammo, and a backpack containing basic survival necessities.
The time period for equipment is our normal history up to the end of ww2, but there is also the inclusion of dieselpunk (it also doesn't take place on Earth, but the planet is similar enough). The main area this would be used would be in a thick forest where movement at the base could be near impossible at times.
Ideally there would also be a combat application to it as well where it would allow soldiers to reposition across the battlefield quickly. For our band of soldiers the battlefield is 360 and there really is no real frontline. Something that would let them hop over terrain, let them hop from tree to tree like a monkey, or scale the sides of a shallow mountain, or slowly hop down from a large height using their environment.
The absolute MAX jump height would just need to be 3 meters, if they want to go any higher they would need to make successive jumps and make a path using their environment.
I am totally fine with elements of handwavium/unobtanium so long as there is a mechanical component to the equipment and sort of grounded reality to it (so no hardened skeleton system + better muscles and that's all). A dedicated resupply squad also joins the team, so replenish able sources are totally fine.
Note that jumping in this case doesn't have to mean only mechanical motion from legs or springs. Something like a jump pack/jump kit from Titanfall or star wars would also be considered a jump device (jump packs from both of those settings just seem a bit to futuristic for this setting, but the use of fuel or gas is valid so long as it doesn't toast the buns of our gang to much).
If one needs an idea for weight, think of something like a US paratrooper during WW2 with all their combat equipment strapped to them, including their extra equipment.