Having been off the net for a while I'm still playing catch up. Max Velocity's article on tactics for the Lone Wolf has stirred the debate, and now I get to add my two cents.
First off, if you absolutely have no other option, then be a lone wolf. A relatively good fire team will make short work of a loan wolf in a react to contact situation. You have to be infinitely better as a loner than you do as a member of a team, because there is NO ONE else to help cover your mistakes.
You have two (or less) eyes, and can only hear as good as you can. That fire team has eight (or less, down to four eyes if you take one from each member), so even if you had a half blind fire team you would still have twice as many eyes as a lone wolf.
The only offensive tactic available to a Lone Wolf is the ambush. Whether this is due to sniping (long range ambush) or an explosive device (short range ambush) that is it. No deliberate attacks, no raids, no anything that requires both fire and maneuver.
Defensively you can't stop anything as a lone wolf unless you get deep and heavy into preparing the battlefield. If you can plant enough explosives you can usually muck up the other sides advance for a bit. But a lone guy with a rifle is just a "react to contact" drill for any decent unit.
Others have written this, and it is all true. But if you really had to be a loner, this is my advice. I've never been a loner, but I've thought about it quite a bit.
First, be an assassin, not a harasser. Figure out who the key players for the opposition are, and target them. Target key personnel in the enemies command, intelligence, or logistic structures. You are an operational cell of one, so be as focused as you can on being operationally effective.
Second, mix it up. If you are great with a rifle, learn to use bombs. If you can make a bomb out of bisquick learn to shoot a rifle. Being able to use multiple modus operendi will help keep the enemy from pinpointing you based on your operational signature any faster than they already can.
Third, know when to call it quits. You don't do anyone any good dead. Wait until the other side makes a big raid and kills a bunch of people, then lie low. If your activities stop after a bunch of people die, then it is likely that the enemy will think they got you in that operation. Wait until there is an influx of people from somewhere so that if you resume operations the enemy thinks it is from a new cell.
Fourth, don't get cocky. If you have had several successes in a row, revert to the third piece of advice, know when to quit. A flea can suck a lot of blood from a dog if it keeps moving and doesn't stop to drink its fill in one spot. This is probably the best piece of advice I can give.
Fifth, lay low. Getting known by a cool call sign stokes your ego, but it also puts a price on your head. Juba is dead, and for all the terror that Juba caused US troops it didn't matter in the end.
Sixth, have a react to contact plan. Whether it is to carry so much firepower that you are a single man fire team or it is to ditch your gear and become a nature photographer (or some other excuse to being where you were) is up to you. But have a plan, and execute the plan as best you can.
Seventh, don't get too hung up on gear: If you have an AK and a sniper rifle and you want to conduct a sniping mission it makes sense to bring the AK for infil and exfil protection. If you have a battle rifle that is capable of making the long shot (AR-10, FAL, M1A, etc) then use that instead of carrying two rifles. There are no "wrong" decisions here, just preferences and what you happen to have available. Gear can dictate tactics to some extent, so understand the limitations of your gear, and your body.
And finally, surrender is an option. Especially if you can sterilize yourself before surrendering. Unless you are sure that your enemy will kill you out of hand then it makes sense to surrender and see if you can't survive the system and live to fight another day. Many of our guests in Guantanamo have found there way back to the battlefield having waited for the legal process to take place.
And that is it, at the end of the day it is always better to work with people you trust.