On Sept. 10, Marine Corps officials announced that all-male ground combat teams outperformed mixed-gender teams in nearly every aspect of a recent infantry integration test.

Data from the months-long experiment showed that mix-gendered teams performed at lower overall levels, completed tasks more slowly, and were less accurate shooters than all-male teams, reported Marine Corps Times. Female Marines also sustained significantly higher injury rates and had a lower physical fitness performance overall.

“I would characterize this as: There's more to be learned,” said Col. Anne Weinberg, deputy director of the Marines' Force Innovation Office. “There's an opportunity to train and become stronger and to execute these tasks in a more lethal manner.”