An Aladdin's cave of books, models, uniforms and memorabilia, Battlefield reflects owner Bob Johnson's years of trading, auctioning and appraising historical antiques in the Twin Cities since the 1970s. Packed floor to ceiling with ex-military merchandise from all eras, the store feels a bit like a warehouse; Johnson says this is partly a necessity -- most of his business is done online, and he ships all over the world. If you're cleaning out a relative's attic, Johnson implores you to bring anything you find in for an appraisal. "Whatever you do, don't toss it out!"