However , their premature use of this weapon deprived them of the advantage of surprise .
Some regular troops from the PDRY reinforced the adoo , who also deployed SAM - 7 anti-aircraft missiles for the first time .
Troops ' premature use of this weapon deprived them of the advantage of surprise .
Some regular troops from the PDRY reinforced the adoo , who also deployed SAM - 7 anti-aircraft missiles for the first time .