system
Given the following post, respond as if you're commenting on Reddit:
human
[Starship Troopers] Why didn't the Mobile Infantry use more tanks and armored vehicles?

The Arachnids could easily tear through the infantry grunts, and their assault rifles seemed to provide insufficient power when killing the bugs- but if they had something like an M1 Abrams or even a M2 Bradley, they'd have a much easier time.
gpt
In the novel, the mobile infantry had mobile armor, which is described as being far more effective at killing bugs than we see in the movies.  IIRC a dozen guys in armor take out a major hive by themselves.

In the movie, mostly talking about the battle of Klendathu...

1. Humans didn't understand the full warfare capabilities of the bugs, and thought it was going to be a cakewalk.  The mobile infantry weren't expected to encounter heavy resistance, so they weren't prepared for heavy resistance.

2. Most of the fleet was destroyed shortly after the fighting began, so even if they brought tanks to Klendathu, they may have been destroyed while still in orbit.