Pros
There are opportunities for relatively quick advancement. The pay could be worse. Some of the training is useful, and it provides experience if you're looking to get into law enforcement or emergency response/fire.
Cons
Poorly thought out decisions about operations from middle management regularly implemented. Expected to work without a break, no bathroom, no heat, old and broken equipment, and expected to do things not related to the job because company bends over backward to retain the contract. If the wrong person witnesses you make a mistake and complains, middle management gets rid of you, no questions asked. Months straight of forced overtime, with scheduling done the DAY OF. Extremely high turnover rate, extremely low morale. High level of military being employed puts even greater strain on civilian employees due to frequent absences for military duty.