I'm going to assume that because I have been assigned this task I have some experience in special operations.
I am also going to assume that I know the jungle well. Here's my plan, I'm going to explain the perfect scenario, everything going to plan, and you tell me where I'm wrong:
Obviously, I am outgunned and extremely outnumbered, and I don't want to be found or else my mission will fail. My first thought is to disguise myself, but the missing soldier will look suspicious and one of the soldiers going back alone for no reason will also look suspicious. So, I find a good ambush point, and two of my hunters come into view. They are very attentive and prepared, but they have one flaw: they are not in view of each other. One of them is traveling at a slightly quicker pace and thus will not instantly notice the loss of a friend. They pass briefly and the one slightly behind the other catches up. They talk briefly in whispers, and continue in the same formation. With a bit of luck, they go right past my ambush point. I sit very quietly as the first one goes by, but when the second comes by, I wait for him to pass a couple of paces. I sneak out of my hiding place and come up behind the soldier. I put a rag to his mouth and slit his throat with a dagger, one of my few supplies. His cries are muffled, his partner is focused on something else and does not hear them. Very carefully, I take him to my hiding place.
This is a critical part, the extra weight makes going stealthy harder, and I know these men are not stupid and that his buddy will soon discover his friend missing. I continue at a slow pace with the man draped over my shoulders. The second I get into my hiding spot, a small clearing in the middle of tall bushes, I hear him whisper and the sound of static. The man has reported the loss of his friend and will investigate thoroughly. His first spot to check is the bushes I'm hiding in. He comes very close and I fight the temptation to leap at him, adrenaline is kicking in. He clicks the flash light on his gun on and uses the barrel to part the bushes. He sneaks in very carefully, I am crumpled on the ground. He nearly steps on me, and he sees the corpse. I spring up, slam the end of the knife into his jugular, (the blunt end of the hilt, not the tip of the blade) this striking of a pressure point stuns him for a second. He is strong and fast but that moment is all I need. I slip behind him, wrapping my arm around his neck and sticking the end of the knife barely into his skin. It bleeds, but he is not harmed, only intimidated. I interrogate him, and get the answer to their plans of searching for me and what they plan to do to me. Obviously, being a grunt, he does not know the battle plan.
I push him forward, and strike the back of his neck with the end of his hilt, where the neck meets the head, I do it with all my strength and it is enough to knock him out with a grunt. The grunt alerts nearby patrols. I easily let him to the ground. I know he won't be out long. As quickly and silently as I am able, I strip him down bare and myself too. I put my clothes on him and his clothes on me, which begins to rouse him. Before he lets out a sound, I slit his throat and he dies noiselessly. I let several splotches of blood get on me. The patrols are getting closer. I leave him in the clearing, pick up his dead friend and put his arm over my shoulder, and pop out of the bushes. I play the role of a hysterical soldier, and call for help. When someone finally arrives, I clumsily fall and drop my friend, falling face first into the mud. As I pull myself out, my face is somewhat concealed by the mud. I explain that I found my dead friend, and must go back to the ship with him, making up some story about being best friends with him. They believe me when I say I didn't see the killer, and several close in on the area to investigate.
Somehow, I am taken to the ship with the corpse. Once I am on the ship, I get rid of all the gear I'm carrying from the soldier's uniform that I don't need. The corpse of the dead soldier is discovered, and I am in suspicion, but I clean my face in the morgue and disappear into the large ship, where I break into the commanders office and extract the battle plan information. I kill him, and hide in the ship, which, after a while, leaves the planet.