Task: Analyze the tweet's sentiment and assign it to either 'neutral or no emotion' or one or more of the specified 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. #sad
This tweet contains emotions: 
disgust, pessimism, sadness