In case you aren’t into Star Trek, the “red shirts” are the expendable crew members. If you see a red shirt going into a dangerous situation, they probably won’t come back. If Kirk takes 5 red shirts down to the planet, Kirk’s coming back alone. It’s a running joke among Trekkers.
First one to transport, first one dead;
Only the fools wear Starfleet red.
If the landing party says “Get your gear,”
Don’t be a hero. Trust your fear!
Expendable crewmen are cannon fodder,
So once James Kirk decides you oughter
Beam down with him to Elba II…
Transfer to Sick Bay. They wear blue.