Any of you knowledgable types give me a fairly straight answer to this, as I have found it difficult to get people to commit to any type of answer. If you have the authoritive reference, then even better. What parts of a mess bill (SNCO) are madatory and how is the cost set....? Was led to believe that the 'Subscription' part was the only part you must pay. Some other parts now becoming questionably overpriced / underused and might like to drop a few of my bill ?