Everyone knows that when you walk up to an Optican Station, you hear the SI say phrases like:
"Optican: Health Care On Demand."
"Need Medical Assistance? Choose Optican!"
"Fast, accurate diagnosis- or your money back!"
But did you know there are different expressions triggered by the
active UNSC Recruiting Centers? By active, I mean that they contain COMM Data that hasn't yet been collected. (Perhaps others will work, too... no confirmations yet.) As you approach a recruiting center, the display will change from the "UNSC Navy - Holding the Line" image to the SI
Optican Image. As this happens, a random sample from the SI's catalog of expressions will play. I tested this using one located in the Southwest corner of District 08, while mapping on Easy. Here are some of the expressions I heard (coudn't get a seventh... perhaps on a higher difficulty?):
"Keep It Clean!"
"Pardon Our Dust"
"Detour: Proceed With Caution"
"Yellow Means Yield"
"Please Remain Calm"
"Metropolitan Disaster!"
Please post more expressions if you find them!