There is a lightsaber in that level, but you can't pick it up or use it, and I for one am glad.
It'd be unbefitting for a Mandalorian (Commandos are Mandalorian by definition - being trained by Mandos themselves) and that would really kill the military gameplay of RC. You don't see Marines on tour in Iraq blocking enemy fire with swords. Also I doubt they've been trained to use a lightsaber, so a Commando would most likely chop his arm off.
Like MachineCult said prove it, a screen shot would do.
Remember the breeze across your face
Remember the swaying sleeves in the wind
Remember the grains of sand beneath your feet
between your toes
Remember the freedom in the never ending waves
Remember I'll be at the beach.
Jedi Academy - Renaissance