one, thats a FAT ASS master chief........(cough)....and two, on the bugie website faq for halo 2 i copied STARAIT off and here it is again

Q		How has Master Chief changed?
A		Chief is using all new armor (Mjolnir Mark VI armor, to be precise) this time around, and the main difference apart from the visuals is its rapidly recharging energy shielding.

 the webpage to it is here http://www.bungie.net/Games/Halo2/page.aspx?section=FAQInfo&subsection=FAQs&page=1  c 4 urself, also teh webpage u guys sed was great does provide very little backstory, wonderin if there was anymore