The old cargo mechanics that separated munitions from assets, construction materials and specialties and three currencies.

People, don't do this to yourself.

Also on the right the concept upgrades window for your unit.

Dual-cannon, extra armor. Front facing guns. Motor upgrade. This model became tedious however. Once you bought or recruited a unit / resident of Silo you would have to go through upgrades for each single unit.

Come 2020 there is some base building involved which takes away this overhead.