Well, what are the objectives, to kill the terrorists or capture them? Obviously the hostages are the main priority, whilst simultaneously neutralising the terrorists. If the objective is to simply to rescue the hostages and kill the terrorists this is (probably) how I would approach it (Pathfinder's scenario) after a whole 10 minutes of thought...
1. Gather as much intell about the terrorists from afar as possible, including continuing the already (apparently) open communications with the terrorists to try and negotiate a peaceful resolution and if unsuccessful at that, use the negotiations to gather as much useful intell information as possible whilst distracting the terrorists from protecting themselves.
2. Use half (6) of the Green Beret team to conduct a close reconnaissance (or close target recconaissance as the Brits call it) on the camp, and provide on site intell, including exact co-ordinates of the fortified positions, (0.50 cal machine guns etc) numbers of terrorists, weapons, equipment, demeanor, routine, camp layout etc, location of hostages and guards, the physical description of where the hostages are being held, ie: in the open, a building of some sort, a pit or cave, whether they are all together, held in separate locations, what they're condition is like (if they are starved and beaten they are unlikey to be able to walk far), etc, etc. Also use recce team to assess likely form up points (FUP's), fire support positions, escape routes, etc for assault teams.
3. The "reserve" special forces unit would be immediately brought into play. (This should give a force of approx 24 GB's and 62 Colombian soldiers). With all due respect to the Colombians, from what I've read of previous missions, they aren't exactly of the highest standard in the world. An IA (immediate action) plan would also be formed, ie: what do we do if hostages start getting capped? As well as a deliberate attack plan.
4. I would form the GB and Colombian soldiers into teams, (or squads if you like) with each squad led by GB soldiers. These teams would then commence training and practising with their pers weapons and equipment on likely assaults and depending on their skills and capabilities and the available intell, would be assigned preliminary roles.
5. After updated intell received and the political approval was given for the mission to go ahead this is what I'd plan. (Bearing in mind this is all theoretical)... After sufficient rehearsals (depending on the amount of time to rehearse) each team would be deployed by helo a long distance away, (maybe 10-15klms, depending on terrrain). Each team would then infil by foot to a pre-arranged and agreed upon lie up point, (LUP) depending on continually updated intell from the RT, the evening prior to the attack. The helo's (and reserve force) would be held in standby only a short flight away and would be (hopefully) of sufficient number to transport all troops, hostages and any captured terrorists. In addition a reserve force (if available, would be mounted on the helo's to help secure the area against rebel attack until the helo's can transport everyone out safely)
6. If a deliberate attack could be conducted I would assign a fire support team (FST) to attack each 0.50cal bunker using anti-armour weapons (AT-4's and LAW's, both have excellent anti-bunker characteristics in addition to anti-armour characteristics) and available machine guns/SAW's. I wouldn't bother with the Mortars at all. You want to rescue hostages not simply kill everyone there, Mortars aren't all THAT accurate and tend to be fairly indiscriminate not to mention lethal...
7. If proper equipment and skillsets were available I would also employ the recce team (RT) as snipers, with specific primary tasking of ensuring survival of hostages until an assault team (AT) can secure the hostages. Snipers would also have the secondary tasking of killing other terrorists and preventing any MANPAD launches should any terrorists escape the "net", when the helo's arrive. Each (FST) is to be primarily tasked with neutralising the bunkers and heavy weapons. Each FST also has secondary taskings of providing direct fire support for the AT's and acting as cut-off groups to ensure (as best as possible) no terrorists are able to escape.
8. My AT's would probably comprise 4 person teams, with a GB leading each team. 40 terrorists would, depending on how they are housed, probably require at least 8 AT's, plus Snipers/RT's, FST's and a reserve/evacuation force. The RTwould comprise 3x 2 man teams, depending on the size and layout of the target area. The FST's would comprise 6x4 man teams, and the reserve force would comprise 4x6 man teams, (due to limited GB's to lead each team and a probable shortage of helo's.
9. After infil, each assault/fire support team leader would conduct a briefing with the RT, at the LUP to obtain a clear picture of the target area and the latest intell. Each team would then be individually briefed by their respective team leader and if the go ahead for the attack was given, each team would move to a designated FUP under cover of darkness.
10. Each team would then spend the night waiting until about an hour before dawn for the attack. The RT would remain in position and keep "eyes on" to ensure that the hostages weren't moved during the night. At a predesignated time, all teams would move into their designated positions, the "starting line" for the attack.
11. The attack would commence simeltaneously with each bunker attacked with anti-armour weapons and GPMG's/SAW's. Each RT would commence killing guards and other terrorists and each AT would race to secure their respective and specific objectives. Each AT would be assigned a respective "finish line" for their assault in order to avoid "blue on blue's".
12. With the hostages now (hopefully) secured, and the bunkers destroyed or the weapons rendered inoperable, the FST's would turn to their tasks of operating as cut off groups and as early warning in case of any "counter attack". A sitrep would be provided and the helo's and reserve force flown in.
13. The reserve force would then assist the FST's to secure the area and the RT's and AT's would go through the processes of providing any first aid/casevac procedures required and ID'ing any remaining (alive) terrorists. The hostages and RT's (who would probably be exhausted), AT's and captured terrorists would then be flown from the area to a secure point. The helo's would return to withdraw the remaining troops from the area.
This is how I would try and plan an assault. I may be forgetting a few things, but it's been a long time since I've actually had to plan an attack. In this forum, I'm also not going to discuss things like recce/comms procedures and other operational information, as such things are vital to allowing these sorts of missions to suceed and most people don't need to know anything about them...