Your Marines Are Useless. Here's How to Fix Them.

Your allied UNSC Marines are more than just background chatter and cannon fodder. They have the potential to be one ofthe most powerful, and overlooked, assets in your arsenal. The secret isn't in their default programming, but in the hardware you give them. You can, and absolutely should, exchange weapons with every Marine you encounter. Giving them power weapons transforms them from liabilities into hyper-lethal squadmates who can turn the tide of any battle, especially when they’re riding shotgun on your Scorpion tank.

This isn't just a minor perk; it's a core strategy. A Marine with a Rocket Launcher has infinite ammo and surprisingly sharp aim. A squad of them, properly equipped, becomes a mobile fire base that shreds Covenant patrols, vehicles, and even high-level threats before you’ve even fired a shot. Mastering this mechanic is the difference between slogging through an encounter and commanding a symphony of destruction.

01

How Do You Actually Swap Weapons with a Marine?tag

The process is deceptively simple and the game never explicitly holds your hand through it. Many players go through entire campaigns without realizing it's possible. Once you learn the trick, you'll never look at a friendly patrol the same way again.

Walk up to any allied Marine. Make sure you are holding the weapon you want to give them. Stand close and face them directly, then press and hold your 'action' or 'reload' key (this is typically the same button you use to pick up weapons or enter vehicles). After a moment, the Marine will drop their current weapon and automatically pick up the one you've offered. You, in turn, will pick up their discarded firearm.

That's it. There's no menu, no complex dialogue tree. Just a simple, direct trade. Be mindful of what you're dropping; you will be stuck with their standard-issue Assault Rifle or Battle Rifle until you find another weapon on the ground. The key is to plan your swaps. Scour the battlefield for discarded power weapons—Rocket Launchers, Sniper Rifles, Fuel Rod Guns—specifically to hand them off to your new fire team.

02

Why Bother Arming Your Squad?tag

Because a well-armed squad is an exponential force multiplier. The AI in Halo: Campaign Evolved grants your allies two incredible boons: perfect accuracy and infinite ammunition. They will never run out of rockets, sniper rounds, or plasma bolts. They become walking turrets, capable of engaging targets with devastating precision while you focus on flanking, driving, or tackling primary objectives.

Giving a Marine a Rocket Launcher turns them into a dedicated anti-vehicle unit. Hand one a Sniper Rifle, and they become a peerless overwatch sentinel, picking off Jackals and Elites from a distance. A squad armed with a mix of heavy weapons can lock down an entire area, providing suppressive fire that makes even the most chaotic encounters manageable.

This fundamentally changes your role from a lone wolf super-soldier into a true squad leader. You are no longer just clearing rooms; you are positioning assets. You are equipping your team for the specific threats you anticipate. This tactical layer is one of the most rewarding parts of the campaign, allowing for creative solutions to difficult fights. Instead of hoarding that last rocket for a key moment, give it to a Marine and get a dozen rockets in return over the course of the battle.

03

The Ultimate Tactic: The Super-Charged Scorpiontag

This is where the strategy truly becomes glorious. In missions where you gain access to the M808B Scorpion Main Battle Tank, you have the opportunity to create the single most destructive force in the game: a fully-loaded tank crewed by power-weapon-wielding Marines.

Before you even think about climbing into the driver's seat of that Scorpion, your first priority is to arm your escort. Find the four or five Marines designated to join you and systematically upgrade their loadouts. Scour the area for every Rocket Launcher, Fuel Rod Gun, and Sniper Rifle you can find. Perform the weapon swap with each Marine until your entire squad is armed to the teeth.

Now, get in the tank. The Marines will automatically take up their positions on the treads, transforming the Scorpion from a simple tank into a mobile fortress bristling with ordnance. As you drive, you control the main cannon, while your squadmates operate as independent, 360-degree turrets with infinite ammo. They will automatically track and obliterate everything in sight. Ghosts, Wraiths, Banshees, and infantry squads will melt under the combined, unrelenting firepower. The gear you give them before they board remains at their disposal for the entire sequence, making the Scorpion a rolling convoy of devastation.

04

Which Weapons Are Best for Marines?tag

Not all weapons are created equal when placed in the hands of your AI allies. Their infinite ammo and crack-shot aim favor certain types of hardware. Here's a quick rundown of top-tier choices.

S-Tier: The Game Changerstag

• Rocket Launcher: This is the absolute best-in-class choice. A Marine with a rocket launcher is a mobile artillery piece that will relentlessly bombard vehicles and heavy infantry. Give one to every Marine you can.
• Fuel Rod Gun: The Covenant equivalent of the Rocket Launcher. It has a faster fire rate and a larger blast radius, making it exceptionally good for clearing out groups of Grunts and Jackals. The arcing trajectory is no obstacle for the AI's perfect aim.

A-Tier: Highly Effectivetag

• Sniper Rifle: In long-range encounters, a sniping Marine is invaluable. They will land headshot after headshot on Elites and other high-value targets, often before they even enter your effective range.
• Beam Rifle: The Covenant sniper is just as effective, if not more so, due to its lack of a traditional ammo magazine. Your Marine will fire it as fast as the weapon's cooldown allows.

B-Tier: Situational but Solidtag

• Shotgun: In close-quarters missions, a Marine with a shotgun provides excellent flank security. They will reliably neutralize any Flood or Elite that gets too close for comfort.
• Plasma Cannon: While less precise, the sheer volume of fire from a detached Plasma Cannon can suppress entire enemy squads, pinning them down for you to finish off.

Avoid giving them standard pistols, plasma pistols, or assault rifles unless it's a direct upgrade from what they're already carrying. The goal is to give them weapons that dramatically outclass their standard issue gear.

05

A Quick Word of Warningtag

Once you've created your super-squad, you must protect them. A Marine with a Rocket Launcher is a high-value asset, but they are just as vulnerable to enemy fire as any other. When piloting the Scorpion, use its heavy armor as mobile cover for your gunners. Angle the chassis to absorb incoming fire and don't rush headlong into overwhelming odds.

A more measured, tactical advance will preserve your fire team and allow you to maximize the incredible arsenal they carry. Remember: they only have infinite ammo while they're alive. Keeping your best Marines in the fight is paramount. Prioritize threats to them, and they will repay you by clearing the path ahead with explosive efficiency.

The Final Taketag

Arming your Marines is more than a fun gimmick; it’s a legitimate high-level strategy that unlocks the full potential of the campaign's sandbox. It transforms passive followers into an active and devastatingly effective fighting force. So next time you see a discarded Rocket Launcher and a friendly Marine, don't just walk by. Make the trade. Create your own personal army. And watch the Covenant burn.