The Chief Executive of the Defence Science and Technology Laboratory (Dstl) is stepping down.
Gary Aitkenhead is to take up a new role with a global technology company.
Chief Operating Officer Doug Umbers will be acting Chief Executive until a permanent replacement is found.
"Gary has led and overseen a number of high-profile activities during his time at Dstl, and we wish him well in his next venture," Mr Umbers said.
"I am looking forward to leading Dstl's world-class experts to deliver cutting-edge science and technology."