This is the same situation the Marines faced in I Corps in 1965-1967, when the majority of combat casualties were from booby traps (IEDs, today). Same with the US Army in II Corps. Faceless enemy that at the time chose to hit and run, until late 1967 and into 1968 and Tet.
I'm not trying to minimize the loss of 7 Marines one day and 14 the next in ambushes, but it wasn't uncommon to lose 20 or 30 to as many as 60 US servicemen in individual large-scale ambushes in SEA in 1967-1969. The main difference then was the VC often stood and fought after triggering their ambush, unlike the raghead bastards who are basically cowards. I'm shocked they could wipe out 6 USMC snipers, but maybe those guys were green? How did they walk into this? Were they betrayed from the inside, like US personnel often were in recon units?