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Disobeying orders and death
In August 2552 the city of Mount Haven on an unknown colony was invaded by the Covenant, who proceeded to dig downriver of the city in search of Forerunner artifacts. In response the UNSC sent in a Company of ODSTs for a snatch-and-run operation; they would steal the artifacts then retreat from the planet.
However, unbeknownst to the UNSC, a team of ODSTs had their own agenda. The nine ODSTs were all former CMA veterans, and felt that they had given enough to the UNSC cause. Their plan was to break into a bank in the city center, and use a spare Pelican dropship to steal the gold and platinum ingots stored in the bank's vault. They justified their theft by saying that the precious metals were going to be glassed anyway, and therefore they "didn't exist anymore." The team would use the gold to retire.
Their plan hit a snag however when they discovered a schoolteacher and a group of children taking refuge in the bank vault, causing an argument to erupt between the five ODSTs in the vault. Gage Yevgenny wanted to abandon their theft and evacuate the children. Felicia Sanderson was in favor of calling in an extra Pelican. Sita, Dale and Orrin however wanted to abandon the civilians to their deaths. Tempers flared, and the ODSTs turned their weapons on each other; Gage and Felicia against the other three. Gage shot Sita first, because she had the heaviest firepower in the form of a BR55 Battle Rifle, however before dying she likely got off a few shots which either wounded Gage or killed Felicia.
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