Stage 1: 2/2 found
1: right after getting the jeep, on the wall to your left a little bit north of where the jeep starts.
2: right after you must exit the jeep, the area past the barricades with the 3 spawn enemy barracks, the left wall.
Stage 2: 2/2 found
1: right at the start of the stage, the blue flame on the left wall.
(credit to SAB CA for that one, can't believe I kept missing that)
2::
after exiting the actual prison and getting to the area with the
destroyed road, head north past the road and up to the area where a
tank appears, there will be a patch of tread marks on the ground right
in front of the secret area
Stage 3: 2/2 found
1: when you first enter the temple area, on your left, big statue, its left of where the enemy APC stops
2: temple area, after the section where there is a
low wall with troops who throw grenades at you, as you head north there
with be a blue circle on the right wall.
Stage 4: 2/2 found
1: right after the raised panks area, after you go back into the swamp
directly after the section where you can use the turret, on the right
wall there will be what looks like a fallen tree on the wall. its
directly above the enemy barracks from the turret section
2: right at the end of the swamp area. before going up the ramp. the last part of the fenced area on the left in the water.
Stage 5: 2/2 found
1: right at the start. brown colored building with little blue and red
flags on the left. theres actually an enemy spawn point IN the secret.
weird
2: during the first tank section, about 2/3 of the way through another
brown building with blue and red flags on the left, you must get out of
the tank and toss a grenade to reveal it, stupid I know.
and thats all 10 secrets in the game.
added credit goes to Sarone T C for throwing that grenade that found the final one.
Lets do this.