Waterboy, a 35M HUMINT collector recruits and runs sources to gain intelligence. In practical matters that means you would, after completing training, be assigned to a BCT or G2X inside the HUMINT/CI section. Your job, on a deployment, is to 'spot' (identify potential sources), assess (decide their suitability as a source based on their placement, access, and accessibility), and recruit the source. Once a source is recruited you run the source, meeting with them and gaining information of intelligence value, then at some point transition (hand-off to another 35M) or terminate the source. Every source in each stage requires a great deal of preparation work and paperwork - you will write a lot. But, you also get to do cool things interacting with people, meeting with folks, and collecting valuable intelligence. Each source is a significant investment though, it's not one of those things where you recruit/run a hundred sources. The ration of paperwork/prep work to meetings are about 10:1 at a minimum. There is also a significant amount of oversight of HUMINT operations, meaning you have to be able to execute operations with minimal supervision according to the law - even when breaking the law is much easier. 35M is a great MOS, but it's for grown-ups with a strong sense of themselves who are willing to put in the work.