The soldier's ability enhanced tank states
You gain the Powered Armored Proficiency feat and access to improved armor. This might be the result of your own engineering abilities, having earned the trust of contacts that can get you experimental equipment, or a powerful patron giving you gear not available to the general public to help you achieve mutual goals. You can add one more upgrade to your armor than its normal maximum number of upgrade slots. If you add this bonus upgrade to heavy armor, you can select an upgrade normally limited to powered armor. An upgrade placed in this bonus slot costs half the normal credit amount.
Does this mean that starting at level 5 every party member now has 1/2 off when purchasing upgrades? Nowhere does it say you can't remove it can give it to another player. ie "oh you need an upgrade solarian? OK let me just install it into my armor for 1/2 off aaannddd there you go"