Australian (field use) rat-pack contents are largely unchanged since before the Vietnam War.
Current contents (give or take) can be seen here...
http://www.militarypeople.com.au/ima...k_Contents.pdf
When I was in the service (late 1980's), I used to have a particular liking for D Rations. The Tortolleni was quite nice. I see the D Ration still has it! My how things change...not (although we had more menus to choose from)! :rotfl:
Piccy here...
http://www.diggerhistory.info/pages-...ck-current.htm
Sometimes we were "lucky" and got "hot boxes" in the field, but not too often. I say lucky because I remember when I was real young watching the cook at Dad's unit make up some hot boxes for the unit in the field. That image remained with me throughout my own military career and tbh, I never really enjoyed hot boxes. To to avoid incrimination, I'll say no more.
Of course, meals in base were quite different. I found RAAF meals to be quite nice, regardless of whether it be Officer, OR or Sgt's mess.