30 November 1941. From: OPNAV. To: CINCAF, CINCPAC (Info). 300419.
Indications that Japan about to attack points on Kra Isthmus by overseas expedition X In order to ascertain destination this expedition and for security our position in the Philippines desire you cover by air the line Manila Camranh Bay on three days commencing upon receipt this dispatch X Instruct planes to observe only X They must not approach so as to appear to be attacking but must defend themselves if attacked X Understand British Air forces will search arc 180 miles from Tedta Bharu and will move troops to line across Kra Isthmus near Singora X If expedition is approaching Thailand inform MacArthur X British mission here informed X.