AN M311; DEPARTING SINGAPORE; WAS TURNED OFF THE SID INTO BAD WX IN ORDER TO AVOID MIL ACTIVITIES.

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DURING OUR INITIAL CLB AND AT APPROX 7000 FT; I ASKED THE CAPT (PNF) TO ASK FOR A R TURN DIRECT SJ FOR WX (PREVIOUS TO OUR TKOF; WE HAD BRIEFED A PLAN TO DEVIATE INSIDE OR TO THE R OF THE SID OR; AT THE VERY LEAST; REMAIN ON THE SID). SINGAPORE DEP; HOWEVER; GAVE US A L TURN TO A HDG OF 350 DEGS; DIRECTLY INTO THE WX WE WERE TRYING TO AVOID. THE CAPT; THOUGH; HAVING THOUGHT THE CTLR SAID TO TURN 'R' TO 350 DEGS; DIALED A RI TURN INTO THE HDG SELECT WINDOW. I ASKED HIM TO CLARIFY AND HE DIRECTED ME TO START THE TURN (TO THE R) WHILE HE DID SO. IN RESPONSE TO THE CAPT'S QUERY; AND WITH SOME URGENCY IN HIS VOICE; THE DEP CTLR TOLD US TO TURN L TO 350 DEGS. I ASKED AGAIN FOR SOMETHING OTHER THAN A L TURN; BUT THE CAPT; NOTING THE URGENCY IN THE CTLR'S VOICE; DIRECTED ME TO TURN L. TURB WAS MODERATE WITH VARYING DEGS OF WINDSHEAR FOR THE NEXT MIN OR SO. THERE WERE MIL ACTIVITIES IN THE AREA (BY NOTAM) AND I BELIEVE THE CTLR WAS TURNING US AWAY FROM THIS. HOWEVER; OUR CLRNC FOR A SPECIFIC SID SEEMS TO IMPLY THAT THE SID WOULDN'T INTERFERE WITH THOSE ACTIVITIES. OTHERWISE; WHAT'S THE POINT IN A SID? IF I HAD KNOWN BEFORE THE TKOF WHAT THE CTLR PLANNED FOR US; I WOULD HAVE BEEN BETTER PREPARED TO EXPLORE OTHER OPTIONS; INCLUDING POSSIBLY DELAYING THE TKOF.