I had this same problem, and i still don't know how to disguise either. The gun they request you to carry is the AR2, or basically the pulse-rifle. You will remain disguised until you fire your gun, so always try to use the crowbar. The best places to kill silently (w/ crowbar) is when they are alone, not visible from snipers, or even when your hidden. It works as far as i can tell. After playing some more, i realized that when disguised, if you run and/or jump too much, your disguise will wear off. Disguising as your victim is a perfect way to get around without being shot, and i encourage you to continue doing so.

引用自 CreeperFace6：

I had this same problem, and i still don't know how to disguise either. The gun they request you carry is the AR2, or basically the saw launching gun. You will remain disguised until you fire your gun, so always try to use the crowbar. The best places to kill silently (w/ crowbar) is when they are alone, not visible from snipers, or even when your hidden. It works as far as i can tell.

Okay, thank you! If I ever figure out how to disguise, I'll let you know. :D

I believe i just figured it out! You do have to do it from the shadows for the best result yes. But you simply kill them with the crowbar (hopefully alone) Then slowly walk onto the body just a step or two. And it should work

I think that im correct. It worked twice in a row

Heyo I know that I'm kinda necroposting right now but I found out the disguise changelog.



"How to get it:
- The disguise can only be obtained by being very close to the combine you kill.
- If anyone sees you killing him, you can't do it.

How to lose it:
- Let a combine see you kill another combine.
- Damage a combine without killing him, alone or not. Turrets, manhacks, rollermines and the like count too.
- Spend too much time in the air (the combine can't jump).
- Let a Combine Elite Soldier examine you from a close distance.
- Die.

While you have it:
- No combine will attack you. Not even newly spawned ones.
- Combine won't be alerted by your gunshots.
- You can move two combine to an area by aiming there and saying !gohere
- You can make other combine frecuent an area by aiming there and saying !patrolhere
- Combine Bouncers won't chase (nor explode into) you.
- Manhacks, rollermines, turrets, etc won't reveal you on sight.
- You will be way slower, as slow as them.
- You can't !taunt while disguised."

not mentioned here is "the disguises will work 1/10 of the time."

however this is from 2012 I don't know where to look for something more updated