Task: Classify the mental state of the tweeter based on the tweet, determining if it is 'neutral or no emotion' or characterized by any of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: Our soldiers in war zones are held to a higher level of rules of engagement than our police officers.
This tweet contains emotions: 
sadness, trust