MIL SWEARINGEN METROLINER CAPT TAXIED ONTO RWY TO TAKE OFF DUE TO MISUNDERSTANDING OF ATCT CTLR INSTRUCTIONS FOR THE ANTICIPATED TKOF INSTRUCTIONS GIVEN TO THE FO.

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WHILE TAXIING OUT TO TAKE OFF ON RWY 8 AT ABQ THE FOLLOWING OCCURRED. AFTER TAXIING TO RWY 8; WHILE STILL TALKING TO GND; THE GND CTLR STATED 'EXPECT NO DELAY FOR DEP.' THIS WAS RESPONDED TO BY COPLT AND LINE UP CHKLIST WAS INITIATED. THE CTLR THEN SAID 'EXPECT IMMEDIATE DEP 290 HDG DEG L TURN.' WHEN HEARING THIS; I BELIEVED THAT HE HAD CLRED OUR ACFT FOR IMMEDIATE TKOF; L TURN TO 290 DEGS. SO WHILE TAKING THE RWY; I NOTICED THAT WE WERE STILL ON GND CTL FREQ AND ASKED THE COPLT TO VERIFY THE 'CLRNC.' I THOUGHT IT WAS STRANGE THAT GND CTL GAVE SUCH A CLRNC. TWR SAID WE HAD NOT BEEN 'CLRED ON' BY HIM BUT SAID 'CLRED FOR TKOF.' NORMALLY; I THINK THIS SORT OF THING WOULD HAVE BEEN UNUSUAL; BUT WITH ALL THE FAA/WADS/MIL AIR TFC CTL OVER THE LAST FEW DAYS; I ASSUMED THE CLRNC WAS ACCURATE. I KNOW THAT FROM NOW ON; I WILL ALWAYS VERIFY WHO ISSUES THE CLRNCS THAT I HEAR; AND WILL QUERY CTLRS IF I RECEIVE A CLRNC THAT SEEMS UNUSUAL; OR OUT OF SEQUENCE; NO MATTER HOW STRANGE FLYING OPS HAVE BEEN FOR THE LAST FEW DAYS.