In the army I was the battery clerk (field artillery) and could type the H3LL out of my typewriter. When I had to do a letter, there was no such thing as a template. So I had to count the number or characters in each line of Heading address--United States Department of the Army, etc., then divide by 2, then if it was 32 characters, I would backspace 16 characters. Every line. After a while I knew how many backspaces each line required and could patter them our pretty quickly.
When I did duplicate or triplicate we had correcting fluid for the top and CC: pages. That was fun!

Dang whippersnappers today don't realize how easy they got it.
Sometimes I wish I had stayed in and did the 20 years. But then I would have never met Carey. It all turns out better in the end...