The likelihood of me living through the nuclear holocaust are pretty unlikely.
Anyway... If I was allowed to live in the town- I'd be the oddjob man. (No, not Oddjob, I mean do odds and ends...)
I'd pick up my trustly L86-LSW (from my cadet armoury...), and use my shooting and limited combat skills to try and protect the town. I'd always be the first to jump up to the fight to defend us. Whether I'd be any use though...
I'd use my mechanical/engineering skills to help patch up machinery (guns, cars, etc, so long as it's mechanical) to try and ensure the town continues to function.
And then... how can I help the town with my history, politicaal studies and English :anguage?
Perhaps become the town scribe/archivist? Sort of like the BoS, but not a twat - combined with my mechanical skills, I could archive and log technology for the next generation of people.
With my knowldge of the English language, I could try to ensure future generations can communicate properly (anyone ever see Threads? I'd like to avoid that...). I could be a teacher. With my historical and political insight, I could guide our leaders - look to the darkest days of the past to avoid an even darker future. Whilst having no power, I could advise our leaders.
But like I said, I doubt I'd managed to live through the explosions or radiation...