drop pods (perhaps precursor to the dropships) is a standard transportation mentioned in the Doom series.

Doom II

The hero of Doom II is said to have gone on leave after defending the UAC Mars Base on Mars. He reached earth by drop pod discovering it had been overrun by demons from the Outside.

Doom 3

Somewhat mirroring the plot of the Doom II marine, the Doom III marine uses a Phantom Class Dropship (Darkstar) to reach Mars, and presumably leaves on one to leave back for Earth after saving Mars.

Dropships also appear in Doom Resurrection.

Doom RPG

Dropships or drop pods figure into the plot of Doom RPG and Doom II RPG, B.J. Blazkowicz III reaches Mars in one, and one is shown in the Doom II RPG comic, and also at the beginning of Doom II RPG.