The Medical Lockers is a fairly common thing found in Chapter 1 theres always atleast one in the Core airlockers and one in the control rooms during 'The Express (A.R.C. Escape)'
Medical lockers usually contains items to Aid the player's survival
The player is required to have the Medical Locker Keys to open these
- In one of the cutscenes, there was a First Aid Kit in the medical locker, but those aren't appear in the actual gameplay.