Mechanical assembly of orbiting sensors. Got stuff all over the place, including Mars, especially when they don't make orbit.
Our company has changed hands a few times over the years and the current regime is more interested in massive defense dollars than civil cents, so out we go at the conclusion of our existing contract
. It was fun but politics and hardware managers that know nothing of hardware have trashed it to the point where I won't miss it much. Fun travel, good pay, rub shoulders with sharpest characters in their field, what am I saying, of course I'll miss it but its time to get a real job now.