As seen on [url=http://img139.imageshack.us/img139/5056/floodguts.png]Bungie's Christmas card[/url] the Rookie and N6 are the exact same size, so it is obvious that they are the same person, as already hinted at extensively in both ODST and Reach.
[b]Note: I've now messaged a forum ninja to close this, post at your own discretion.[/b]
[Edited on 12.14.2010 6:03 PM PST]
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Get your facts. How could a spartan become an ODST ( you said odst becoming a spartan) several years after he died? BTW in case you didnt know Halo 3:ODST vomes AFTER Reach. Reach is a prequel.