However, I find a later reference (6 Jun 1968), which is here
At 1:30 P.M. on Saturday, 3 June 2000, a park atop a hill in Closter, New Jersey, will be re-dedicated. Schauble Park was named to honor the memory and the sacrifice of one of our own, Corporal Kenneth W. Schauble. Ken was a Squad Leader with the 2nd Platoon, "Echo" Company, 2nd Battalion, 26th Marines. He served at Khe Sanh on Hill 861-A during the 1968 Tet Offensive, and he was later Killed in Action on 6 June, 1968 during an intense battle in "Leatherneck Square" near Con Thien. The date of the ceremony closely coincides with the 32nd anniversary of the day he and 13 other Marines died On the day of his death, the 2nd Platoon of "Echo" Company was on a security patrol when they engaged a large North Vietnamese Army force concealed in a bunker complex. After a pitched battle which lasted several hours and resulted in numerous casualties on both sides, the 2nd Platoon was cut off nearly out of ammunition, and had only sporadic communication with one remaining radio. Realizing the only hope was to break out, Ken gave the order to "fix bayonets" and he led 2nd squad "over the top," on line, into the enemy bunker complex. While Ken was killed instantly when struck by a machine gun bullet, the 2nd squad pressed the attack suffering near total casualties while pressing the attack into the enemy bunker complex, killing numerous NVA. Jim Kaylor, the only survivor from 2nd Squad, said "Ken was one of the many brave hearts who died that day; 14 Marines were killed and 11 wounded. He was always one of my heroes because he was a bright and very brave man. Ken Schauble was a strong leader, tough as hell and he loved the Marine Corps!"
All that being said, James Kaylor supplied a more complete report of the action, without mention of bayonets, which is here
After reading through these reports of actions, now more than 40 years old, the presence or absence of a bayonet charge seems so very, very irrelevant to the courage shown by these Marines in two encounters.