 1st Battalion / 7th Cavalry , 3rd Brigade 1st Cavalry Division was in the Fishhook very early May through 30 June when they crossed the river back into Vietnam . There was extremely heavy combat throughout the period . American losses were very heavy , with all units relying on heavy inflow of replacements to try to maintain at least half strength in the field . In one company , of all the men who had entered Cambodia , only nine left on 30 June , the rest having been either killed or wounded and evacuated . The unit was awarded the <unk> Unit Award , equivalent to individual Silver Stars , for their combat performance in the Fishhook . 
