Tying Up Loose Ends

M4 - Tying Up Loose Ends is a main mission in Deus Ex: Human Revolution.

Give the Typhoon to Pritchard
After returning from Milwaukee Junction to Sarif HQ, give the Typhoon to Pritchard in the Tech Lab on the second storey.

Meet with Sarif in the Penthouse
Next, see Sarif in his Penthouse office by taking the elevator where he will brief you on your next missions.