There has been a a lot of discussion everywhere about how Jun dies in Halo Reach... if he does die that is. Here you can discuss it. Have heated discussions if you have to. But for starters, here's what I think.
I believe he doesnt die. In the last meeting you and the rest of Noble Team have with Jun, his objective is to escort Dr. Halsey to Castle Base. The main layout of Castle base is indestructable, and it contains much of the information of the UNSC. Dr. Halsey is apart of something called operation "White Glove" which means that she is too destroy castle base if the Covenant invade it to Castle Base to get information. In that last meeting, Noble 1 (Carter) tells Noble 3 (Jun) "Dont Let anything fall into Covenant Hands Soldier" Meaning that he needs to make it out of Castle Base and make sure that the Covenant did not get any valuable information. The Covenant did attack and Dr. Halsey and Jun made it out through the mine under Castle Base.
I believe he doesnt die. In the last meeting you and the rest of Noble Team have with Jun, his objective is to escort Dr. Halsey to Castle Base. The main layout of Castle base is indestructable, and it contains much of the information of the UNSC. Dr. Halsey is apart of something called operation "White Glove" which means that she is too destroy castle base if the Covenant invade it to Castle Base to get information. In that last meeting, Noble 1 (Carter) tells Noble 3 (Jun) "Dont Let anything fall into Covenant Hands Soldier" Meaning that he needs to make it out of Castle Base and make sure that the Covenant did not get any valuable information. The Covenant did attack and Dr. Halsey and Jun made it out through the mine under Castle Base.