Task: Categorize the tweet's emotional tone as either 'neutral or no emotion' or identify the presence of one or more of the given emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: A 'non-permissive environment' is also called a 'battleground' - #MilSpeak #hilarious
This tweet contains emotions: 
joy