We have about 50,000-60,000 Ground Troops IIRC. Hightly trained in Jungle warfare because we need that for defence.
We have 400 SAS and we have the 4RAR which is also a cammando force that are almost as good as the SAS.
Our troops have lots of experiance and knowlage about jungle warfare because we have been fighting in jungles since WW2. We went to Vientnam aswell so learnt a lot there. I think we might have even been in Korea the first time round aswell. Pluss we have to send peace keepers to pacific islands and East Timor a lot.
We have quite a highly trained army. Even if we only have 50,000 we would still be able to cause a lot of damage. and once the Planes are involed it will help us even more. Plus if we go in im 100% sure that America will go in aswell due to some Contract/Treatie we have both signed to make sure we help each other in time of need.
But like john Howard said, Its only a last resort