Much quicker maybe but wrong,Moose is correct. Read the following:
SPARTAN- 044, Anton. He was one of the units best scouts. The two stood there a moment and then Anton
moved his hand, making a quick, short gesture with his index and forefinger over the faceplate of his helmet where his mouth would be. That was their signal for a smile – the closest and Spartan got to an emotional outburst. Pg 177 Halo First Strike
Kelly quickly reached out and
swiped her two fingers across john’s faceplate. Pg 188 Halo First Strike
Kelly looked over to Linda and
drew her two fingers across her helmet in the smile gesture. Linda returned a rare, bare smile to her. Pg 268 Halo First Strike
Index and forefinger....kina self explanatory after that.Funny enough alot of the hand signals used in the book, mimic real world hand signals, they are quite as precise as real world signals but close enough. I know enough of them to make you sick.