The military is catching flak over its new order to integrate women into combat, including special operations forces.
Women could be eligible for Army Ranger training in 2015 and the Navy SEALs the following year.
The Center for Military Readiness fears standards will be lowered to allow women into those elite fighting teams.
The center says instituting gender-neutral standards could mean removing or weakening physical tests necessary to make the cut or creating different standards based on equal effort rather than equal performance.
Lower standards could lead the SEALs and Rangers to accept hundreds of less qualified male recruits into their training programs.
In Coronado, Calif., where SEALs are trained, public opinion is mixed on the idea.
While several expressed approval, one man said: "It takes a lot to be (a)Navy SEAL. I respect all that they do. I don't know if there are many ladies that can do what those guys are able to do."
There were also concerns about distractions.
"What you need is a bonded team who are focused on their mission not on who sits next to me or this guy is hot or that girl is hot," one woman said.
The order follows revelations of a startling number of sexual assaults in the military.