This World War Two USMC Purple Heart and Bronze Star medal grouping belonged to a Marine who had been a Raider, but later transferred to the Ninth Marine Regiment, Third Marine Division. While with the 3rd Marine Division, he was wounded during the fighting on Iwo Jima.
Both the Purple Heart and Bronze Star Medal are one of the correct styles, for these medals, that the Marines and Navy used during World War Two. The two cases are also the one of the correct styles used by the USMC and USN during the War.
The letter discussing the awarding of the Purple Heart and also the deformed bullet, were both found inside the Purple Heart case. I have had many groupings over the years, were Veterans kept the bullet or piece of shrapnel that wounded them as a souvenir. I am guessing that this is the case with this bullet, but unfortunately have no other information regarding the bullet.