Medical scanner
From Halopedia, the Halo wiki
A Medical Scanner is used by UNSC Naval Corpsman [1] to help and treat wounded and injured UNSC personnel. [2]. It is unknown what the exact function of the device is, however, it can be reasonably assumed that it x-rays and possibly CAT scans the patient, checking for tissue and bone damage. It also may contain a medical encyclopedia, of sorts, for field medical procedures and remedies.
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http://uk.youtube.com/watch?v=IORDL-izIbU&feature=related Spartan laser is used for mock up.