Well I'm here to talk about all of the infantry in Halo Reach. Unlike previous Halo games, there was more than just Marines & ODST's on the battlefield. You the Army, Marines, Navy, ODST's, Private Militia, & Spartans. I post the levels of when they appear.
Winter Contingency: Army & Spartans
ONI Sword Base: Army & Spartans
Nightfall: Private Militia & Spartans
Tip of The Spear: Army, Marines, & Spartans
Long Night of Solace: Marines, Navy & Spartans
Exodus: Marines, ODST's(Bullfrogs), & Spartans
New Alexandria: Marines, ODST's(GySgt. Buck's squad.), & Spartans
The Package: ODST's & Spartans
The Pillar of Autumn: Marines & Spartans
Lone Wolf: Spartans(All Dead)
Winter Contingency: Army & Spartans
ONI Sword Base: Army & Spartans
Nightfall: Private Militia & Spartans
Tip of The Spear: Army, Marines, & Spartans
Long Night of Solace: Marines, Navy & Spartans
Exodus: Marines, ODST's(Bullfrogs), & Spartans
New Alexandria: Marines, ODST's(GySgt. Buck's squad.), & Spartans
The Package: ODST's & Spartans
The Pillar of Autumn: Marines & Spartans
Lone Wolf: Spartans(All Dead)