Loose Rounds by War Stories.
Wheels, ship design, blood transfusions, field rations - all small, but nevertheless significant developments that have had a major impact on military history. In this special season produced in cooperation between Nammo and the podcast War Stories, showrunners Adin Dobkin and Angry Staff Officer look at some of these innovations and discuss their implications. You can find the whole series by searching for "War Stories" on podcast services such as iTunes.
You can also play each episode here using the players below.