Alright. I was planning on making a medieval fantasy type game with all of the customization for your troops, so this would work in a fairly similar manner.
Basically, you make a unit by combining aspects/tags/whatever you want to call them. There are two types. Optional, and required. Optional ones can usually be added to anything, give a bonus, and usually stack. They represent things like equipment or skills. Required ones have to be had, and many of them cannot both be on the same, though in some cases, you can have two required traits from the same category.
I wasn't planning on science fiction, so this is an incredibly basic example using arbitrary numbers, but:
Mechanised Infantry Squad
10x Infantry (R); Cost: 10 MP, 50 CR; Move: 5, HP: 20; Range: Melee, Damage: 10, Infantry, Biological
10x Light Armor (R); Cost: 30 CR; Move: -1, HP: +10, AR: 10
7x Assault Rifle (O); Cost: 35 CR Range: Medium Damage: +30, Automatic, Firing Modes(Range: Long, Damage: +20)
2x RPG (O); Cost: 30 CR Range: Long, Damage: +60, Single-Shot, Explosive, Shaped Charge, Heavy
1x LMG (O); Cost: 10 CR Range: Long, Damage: +10, Automatic, Suppression, Heavy,
10x Grenades (O); Cost: 20 CR Range: Short, Damage: +20, One-Use, Explosive, Concussive, In-Direct
10x Pistol (O); Cost: 15 CR; Range: Short, Damage: +20, Light, Fast
10x Knife (O); Cost: 5 CR; Range: Melee, Damage: +20, Fast
+
Transport
Wheeled Vehicle(R); Cost: 4 MP, 200 CR; Move: 15, HP: 130; Range: Melee, Damage: 30, Wheels, Vehicle
Medium Armor (R); Cost: 80 CR; Move: -2, HP: +20, AR: 10, Environmental, Passive
10x Transport Capacity(O); Cost: 100 CR; Move: -1, HP: +50, Environmental
Turreted HMG (O); Cost: 30 CR; Range: Long, Damage: +25, Automatic, Suppression, Heavy, Turreted, Gunner
These are two units that act together, and cost 605 CR and 14 MP overall. It is a generalist unit, without a leader, and can get where they are needed quickly.
The abilities do different things that act differently, there are various uses of cover and such, armor should be decently simple, though it requires some wrangling to make pistols better than assault rifles up close.