Date correction of original sighting report (1968 not 1969) of UFO over Otis AFB; F-4s chased off UFO.

The incident posted on 9/12/99, regarding the 7/4/1969 sighting over Otis AFB was accurate, except the correct year was 1968.  
I was with the 552nd Air Police Squadron and on the evening of 7/4/1968, I was guarding the Falmouth Gate-one of the three perimeter gates.  That evening was uneventful until ~2100 hours.I received an urgent phone call from my Sergeant, who ordered me to close the Falmouth Gate, adding that we had been placed on Full Base Alert! 
After approximately 1 hour, he called back to say that the Alert was over and to re-opened the Gate.  Later,the SGT came out and informed me that there had been an actual UFO hovering over our underground missile site; that our F-4 jets had scrambled and were on an intercept course. The intruder then initiated a 360`maneuver, accelerated at an unimaginable speed and was gone.