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Double Subverted: But it gets destroyed shortly before the final battle, leaving him with the two guns and grenades that he started with.
Parodied: Bob has a rare phobia of carrying too much stuff, causing him to freeze up if he tries to carry more than one weapon (to the point where he can't carry a pocket knife and a gun at the same time).
Zig Zagged: Which weapons Bob can carry and which he can't seem to be rather arbitrary, thanks to a bug which means some count towards the limit and some don't.
Lampshaded: Bob wonders aloud why a Sig Sauer P228 takes up the same amount of room as an anti-tank missile launcher.
Invoked: Bob was trained to limit the amount of weapons he carries in order to make sure he was able to keep them properly maintained (if you're carrying a small armory, it's hard to clean them all, after all).
Exploited: The Big Bad issues all the troops in his fortress with weapons that can't harm him, hoping that Bob will have to discard his other weapons before reaching him.
Defied: Bob carries a large satchel which is Bigger on the Inside and trains so he's used to moving with it specifically so he can carry all the weapons and ammo he wants.
General Ripper: I'm disappointed in you, Sergeant. That Zerg Rush should've been no problem for someone of your skills. Bob:With All Due Respect, sir, my armor has room for two guns and a half-dozen grenades and I ran out of ammo for all of them.
Conversed: A reviewer compares Generic Space Marine Shooter 2000's limited player arsenal to Halo among other aspects and laments that nobody seems to be trying anything new in FPSs anymore.
Implied: The Player Character is Alice the medic (who can't legally carry weapons, aside from her medical equipment). Bob and the other marines are never shown using more than two different weapons at once, implying this trope applies to them.
Played For Laughs: Bob has several funny lines for each weapon when he's forced to discard it (including a few Easter Eggs when he swaps out specific weapons).
Played For Drama: Despite its name Generic Space Marine Shooter 2000 is a Survival Horror game. The player has to plan ahead and choose their weapons carefully, lest they meet something which can No Sell their attacks.