Their just thrusters we've been using them since the 1950s. What idiot "Change Agent" decided to redesign them.
So much institutional knowledge has been lost in the last 20 years.
Back in the long ago, I was running a computer languages group in the Boston area and invited Captain Grace Hopper to speak. She spoke on the Archeology of Computers. Her thesis was that the knowledge that is accumulated at one point of time needs to be retained because future developments may make use of it. Small main memory computers solved problems in ways that the original small personal computers could make use of.
I can, to this day, see her standing so straight in her Navy uniform and saluting at the end. When I drove her back to the airport, she gave me the exact addresses to which I was to write and told me exactly what to say to the people paying her way. Worshipped that lady.