If the 'Resonance Cascade' was real, what would you do ?
Whoa now, the resonance cascade, the Combine invasion and the appearances of the G Man are all very different events. Also, I believe the Combine simply enslave the human race instead of allowing them into the military and there's no way anyone would be able to choose to get involved with the G Man, it seems like you don't find him, he finds you. In the event of resonance cascade I'd keep on living my life and be glad I live in the UK, however in the event of Combine invasion I probably would just become one of the enslaved many.
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