This problem is worse in government labs and large corporations because they attract those concerned about job security. Scientists unable to secure private sector work become dependent on government work where credentials are more important than performance. As a result, nobody shows an interest in simple projects to adapt proven technology to develop future weapons. Meanwhile, body armor research is zero, as well as hand-grenades, machine guns, mine detection, and personal gear.
Any modern nation can leap ahead simply by adapting proven technology to current weapons.
This issue includes three revolutionary weapons which can be developed in a couple of years.