In combat veterans, the experience of posttraumatic stress disorder appears to interact with which sense?

Olfaction.

Explanation:

Combat veterans includes the individuals that are released from the service that were released after 2003 will get the health care system benefit for themselves and for the whole family.

The post traumatic stress disorder in Combat Veteran is common as they had experienced severe tragic events and fights. This stress might result in the loss of memory and flashback of the past events. The individuals loses the olfaction sense that are related to smell.

Thus, the answer is olfaction.