Power Armour, if similar to that seen in the Fallout computer games, would have many uses in the military, most of which probably aren't combat roles.
I would suggest that 150 kg is quite light to make it a viable platform, maybe around 500 kg would make more sense, for full Power Armour, and 150 kg for a simple exoskeleton, Power armour offers protections and huge gains, exoskeleton offers only carry capacity.
Anything that doesn't need confined spaces would be possible, especailly if decent armour, simple exoskeletons are already is testing for the US military, its the power that is the struggle, these allow a soldier to carry more weight
Speed in combat is very important, maybe the motors could proper a soldier to have longer strides for the extra speed but it would take a lot more to work on the suspension to compensate for... so power armour is unlikely to beat a soldier in a sprint to cover, but they wouldn't need the cover if they were armoured, they could be a moving riot shield, plus potentially be able to carry more effective heavy weapons.
Most ground forces have at a Squad Automatic Weapon, but they ammo is split between the rest of the squad because it is so heavy, a PA user could carry a .50 cal fairly easily and control the recoil while also carrying the ammo.
Construction, the military does so of the most speedy and complicated construction projects short of sky scrapers, they need to level out a forest to make a runway... send the engineers in to do so, often being done a by hand and explosives just to make a helicopter landing zone, PA could allow it to be done either faster or with less (hard to replace in a firefight) explosives, or maybe even done by the PA user ripping plants out by hand.
Naval air wing & Air force
These guys would love power armour... refueling an aircraft is not that bad in the grand scheme, but re-arming it... having to use equipment to lift missiles and bombs and mounting them takes a long time (they actually do it very quickly and efficiently for what it is they are doing, but it still takes a long time in a war zone) and every second a plane is on the ground in a combat zone is a second wasted, someone in PA could potentially lift up the ordnance and attach it with little to know effect far faster.
Same goes for anything in any of the Logistics divisions
And it fully sealed and protected, then any form of Nuclear Biological or Chemical situation could be more safely handled...
only the marines wouldn't get any, all around the world Marines are only allowed hand me downs from the other services