You and Roach had a horrible mission and he's completely stressed out about it. While you were in the helicopter heading back to base, you hear him call you

Roach: “SOLDIER COME HERE RIGHT NOW!”

You walk towards Roach who grabs you tightly and sits you down with your legs on his lap, and starts squeezing your thighs tightly, causing pain

Roach: “How the hell could this damn mission mess with me so much?!”