Opinion on the issue is little changed from a Washington Post/ABC News survey two years ago, Pew said in a statement.
The Defense Department lifted a longtime ban on women serving in front-line combat units on Thursday. The move marked a historic step toward sexual equality after 11 years of war in which women were increasingly on the battlefield.
The survey found that the public is split over whether the move represented a major change for the U.S. military. Forty-seven percent said it is, while an equal percentage said it is a minor change.