Navy Corpsmen attached to the 'green side' will cater to their own Marine line companies, but eventually some manage to trickle down into the Battalion Aid Station (BAS) for further medical analysis. Here, the BAS acts as a clinic since it is the current medical treatment facility.

At most, the BAS carries two Navy medical officers (doctors). The multitude of casualties that stream in on a busy Monday morning, however, would be too tedious for only a couple of doctors to handle. Fortunately, Corpsmen assist by handling the preliminary interview, the SOAP note, and executing the proper exams. They act like gatekeepers, caring for the common and the routine cases, consulting the doctors only for unknown analysis and other expert advice. This keeps the green Corpsmen in full contact with their primary medical responsibility, the Marines, while freeing up the medical officers to tackle the Battalion's medical affairs.