In a part of mission 6, you defeat a group of men and a cyborg wielding a penatrator in a large room. Then you go through some doors and onto a balcony with plants under you.

If you have the ASP Rifle (M-TAR knock-off) it's a good idea to use that. Two men will be attacking you from below.

When you kill them do not jump down where they were just yet; there is an extremely large cyborg wielding a multi-rocket launcher waiting for you if you do.

Instead, jump right across from the doors you just came through. Hide behind the first obstacle you see. Then, get out from your spot and shoot the machine with your ASP once. That's to draw its attention so it comes towards you.

Once you get its attention, quickly get back to your hiding spot. When you hear it has stopped walking, simply lean out from your spot. It won't notice you. Even if you shoot it, it won't notice you. So keep shooting it with your ASP or other weapons until it explodes.