

Click on the technician to have the armor repaired just like with the medics. You will be assigned a shotgun but it won't be useful right away as the next fights take place outdoors - only use it at extremely close range. Soon after, you will meet Corporal Mahler and his little team.

The first enemy is a Gunner, a large humanoid Strogg armed with a nail gun and a grenade launcher. Jump over the railing to collect some fragments of armor, once you reach Bidwell you will be assigned a new objective: destroy the nearby hangars as the aircraft prevent the team from advancing and destroy the anti-aircraft. You will have to move on the bunker walkways but you will soon reach an open area near the trenches. Reach Cortez and exit the level together. Immediately after reaching the doctor, watch out for a Brute that comes out of the ground, eliminate it and drop into the hole from which it popped up to find some armor then pull the lever next to the ladder and resume the path towards Badger. When you reach the Badger team you will be asked to go back to get the doctor, along the way you will meet the first Berserker, a humanoid Strogg with a spike on one arm and a hammer on the other, pay attention to their electric area attack.

Later you will meet the first Brute, a large Strogg warrior who will try to hit you in close combat instead of shooting you: step back as you unload everything you have on him. Avoid the explosive barrels, as soon as the first marine dies you can pick up the machine gun and kill Strogg. Start going through the bunker, shoot the Strogg guards from a distance as your blaster is more accurate than their weapons. Talk to the other soldiers next to you, click on the doctor to get healed.
