[@jakeb1993]

That doesn't really answer my questions. 

Point the First: A military base wouldn't be crumbling after three years. Scavenging would not apply there. If you were picking through a store or residential building that had already been raided for supplies, or a partially collapsed building for cans of food or medicine, [i]then[/i] scavenging would come into play. Walking into a building that logically would contain the items you need (while not being claimed by others at the moment) would count as salvaging. And yes, it is comparatively easy to salvage on land rather than scavenge. 

Trapping: You keep using this word. I do not think it means what you think it means. If Trapping ≠ Trapping, then switch up your skill name to something specific that better describes the skill you are trying to communicate. I'll be frank with you, this skill looks a bit schizophrenic. I am also quite unclear as to how Electronics fits into this.  

Crude Mechanics = Basic applied engineering, then? 

Again, given his bio, where and how did he learn his post-outbreak skills? You have him in a relatively cushy position, with the exception of his last month on his own. Skills and/or History must be altered to match one another; history must explain skills.