Note: my grandfather invented some of the rf sensor technology designed to be airdropped by the US military over the forests of Vietnam for this exact thing. It worked well for what it was designed for.
Wait until you find out about budgets, especially when allocating for things that big chunks of the population aren't even supportive of.
The plan would be to gather intel, map, and move through, one group at a time with enough soldiers (50 to 100) to deal with smaller unmiliterised enclaves.
Brazil is rolling back the free-for-all that was established under Bolsonaro, but if they're handling it delicately, that's likely good news.
Brazil deployed SIVAM [1] about 20 years ago. At the time it was a state-of-the-art radar surveillance system. Not sure how they kept up with tech advances, but it still gives a significant edge to the GEF unit.
[1] https://en.wikipedia.org/wiki/Amazon_Surveillance_System