I found this information on the TOTM. Looks like it doesn't have the shelf life of an MRE which is up to 6 years depending on storage.

This product is designed to be a "just in time"/Direct Vendor Delivery (DVD) item with a 7-10 day delivery time. The shelf life of the TOTM at the time of delivery to the customer will be no less than 12 months.

http://www.dscp.dla.mil/subs/rations/meals/totm.htm