
There is a random encounter where a BoS Knight and an Enclave Soldier talk about this armor, and why the BoS never recovered it from Old Olney.
This armor can be repaired with all other Power Armor variations, but not Enclave and Tesla variants. It’s also worth noting that no matter how many Med-X chems the suit dispenses to you, you will not become addicted to Med-X. It will not dispense Med-X when you have none in your inventory, as it checks to see if Med-X is available before attempting to dispense.
The PMPA will use Med-X in your inventory, so don’t wear it if you want to keep that Med-X for a special occasion. This feature (and the suit itself) may be a nod to the HEV suit from the Half-Life franchise, which also administered medical care (including morphine), and had an on-board computerized voice (albeit without a personality). In addition to the Med-X dispensing system, the armor features an onboard voice that resembles Mister Gutsy in terms of sound and personality. This armor, however, can be repaired by the T-51b, so be careful not to make that mistake. The T-51b Power Armor can not be repaired by this armor. Despite looking like BoS power armor it has a star on the shoulder-pads, painted in the colors of the USA. If the player leaves after going into the sewer it will disappear. Since it is on a timer it does NOT dispense Med-X during the heat of battle (when you’d need it most). The armor dispenses Med-X every 2.5hrs after checking your hitpoint total.
This armor still requires Power Armor training perk to use. The user manual found with the armor details that the final version was to also include a lethal chemical that could be triggered by a superior officer if the soldier deserted. The armor was planned as an automatic medical supply dispenser, meaning troops would not have to be evacuated for medical treatment. Its outward appearance is nearly identical to T-4x Power Armor series. Unfortunately, the prototype version can only administer Med-X, the game’s version of morphine. The Prototype Medic Power Armor was designed to administer medical attention to the user as necessary during combat.