A combination of Adepta Sororitas, sapient androids and if required, militia hired from the world in question. I like to keep the amount small and highly trained though. Precision strikes, not a giant steam roll. I'm a bit more conventional compared to other jumpers.>Transportation
Dropships for light troop transport with a bit of dakka so they can give CAS.
If I want to use armour I fly over my Aigaion from Ace Combat and paradrop them from the landing strip. I charge out the nose for that though, so if the client wants heavy weapons I allow them to organise transport.>Tactics
Never leave home without an M29. I'm watching S2E3 of Westworld thinking if they had just used one mortar that battle would have been over in 5 minutes. Also drones.
. If you have to go up against a big army or an entrenched position shell the shit out of them first. If you can cut off the head of the snake with a precision raid though, it's often better to do it that way. Most henchmen are just working a day job or are pressed into service, so I don't like it when they die.