will this hold true?

BAGHDAD, Feb. 7 — With two more helicopter crashes near Baghdad, including a Marine transport crash on Wednesday that killed seven people, the number of helicopters that have gone down in Iraq over the past three weeks rose to six. American officials say the streak strongly suggests that insurgents have adapted their tactics and are now putting more effort into shooting down the aircraft...

...Historically, improved tactics in shooting down helicopters have proved to be important factors in conflicts in which guerrillas have achieved victories against major powers, including battles in Somalia, Afghanistan and Vietnam...