Good morning gentlemen,
I was stationed with the Air Force at Shaw AFB, South Carolina from 1971 until 1975. Virtually ALL B&W work was shot with 4x5 inch Tri-x FILM PACK, exposed through a Super Speed Graphic. Yes, we would "rob" the pack to save film. We developed them in trays, in I think "Armed forces developer #3". Studio portraits were shot on regular 4x5 cut film, Plus-x I recall, using a C-1 Deardorff with a reducing back and developed in 4 sheet racks in 3.5 gallon tanks. Yes, you pulled the tab, either left it in place OR tore it off. I usually left it in place and wrote captions on it. With the wind up front shutter I could make one exposure every 6 seconds. They were fast and large capacity. It was thin base film and very sharp. We printed them in Omega enlargers with a glass carrier for flatness. In 1975 I was stationed at RAF Lakenheath UK. I continued to use Film packs occasionally until about 1980. I've used 2 1/4x3 1/4 several times and perhaps 3 1/4x 4 1/4 once. I truly wish they were still available today. O, I forgot to say, don't EVER pull one of the tabs out of numerical order. I just remembered, I've even seen them in 3 1/4 x 5 1/2 postcard format!
All the best,