I do love the premise of sending players into a haunted forest that's been recently been burnt down and unfortunately is still haunted. The Vessel, the main threat of the adventure, is a big threat that could potentially snowball if players end up being killed by it, encouraging players not to dawdle around and work quickly. This does pose a noteworthy risk of a TPK, I would advise that Referees give players some warning if they're about to be attacked by the vessel, and maybe give them another way to scare it off. I'm not a fan of the blue background colour used throughout the document; its not easy on the eyes. Other than that and a couple of typos (in the Vessel's Personality Absorption 'trails' should read 'traits'), the layout is clear and information is easy to find. All in all Operation Free Fire does need some adjustments, but it does have the makings of a good One-Page horror adventure for FIST.
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Appreciate the feedback! Definitely want to do some tweaks to fix any errors and to make it a bit more balanced, wanted The Vessel to be a persistent threat that'd last multiple encounters throughout the adventure, and may not be defeated, but I think I may have overdone it in my unfamiliarity with balancing FIST encounters. Also kind of agree with you on the background color, wanted to give it a unique look but I think the printer friendly version ended up being a lot nicer to look at.