 What is the relationship between Polk and Walsh? What is the central complication in their history together?
Perhaps there was method in Colonel Walsh's madness—murder-madness—when he ordered Major Polk to scan the planet for a guy named Joe. The rest was gravy, and Colonel Walsh wasn't going to let me get by with gravy. If Walsh really wanted to know the reasons for the revolt, I could give them to him in one word: Walsh. It had been going on for six months now and we'd lost at least a thousand men from Space II. And I thought about Colonel Leonard Walsh and how he was supposed to be quelling that revolt. "Yes," I said, still thinking of Colonel Walsh. "It's impossible to tell exactly where it all started, of course," Bransten was saying.
 Colonel Walsh is Major Polk’s senior officer. Their relationship became contentious in boot camp, when Polk reported Walsh for falling asleep on the job.
 Colonel Walsh is Major Polk’s senior officer. Their relationship became contentious in boot camp, when Walsh reported Polk for falling asleep on the job.  Colonel Walsh is Major Polk’s ex best friend. Their relationship became contentious during the Terran occupation of Mars, when Polk realized Walsh was prejudiced against Martian natives.  Colonel Polk is Major Walsh’s ex best friend. Their relationship became contentious in boot camp, when Polk reported Walsh for falling asleep on the job.  Colonel Walsh is Major Polk’s senior officer. Their relationship became contentious in boot camp, when Polk reported Walsh for falling asleep on the job.