"defence science" is correct and usable in written English.
You can use it when referring to scientific research or technology that is used for national defense or security. For example, "The government has been investing heavily in defence science to protect its citizens from threats abroad."
Plans for the military's maritime drones are set out in documents published by the MoD's defence, science and technology laboratory.
North Korea cites what it perceives as a US military threat as a key reason behind its need to build nuclear weapons, and has poured a huge chunk of its small national budget into defence, science and technology.
Motorola and Alcatel One Touch are manufacturing waterproof phones with the help of P2i – a business established to commercialise technologies developed by the UK government's defence science & technology laboratory.
Among them is the embattled MP Stuart Robert, who was then the opposition's defence, science, technology and personnel spokesman, and is now under intense political pressure over a controversial trip to China in 2014.
The Australian newspaper reported that a state government itinerary of the official opening showed the event was also attended by Robert – then the federal opposition's spokesman on defence science, technology and personnel – and the Queensland Liberal National party's then president, Bruce McIver.
The committee's report also recommended the MoD should spend more on defence science and technology, and research and development.
Other than the massive injections of cash through the Apollo programme and Obama's smaller stimulus package more recently, non-defence science funding has remained pretty stable as a proportion of government discretionary spending since the end of World War Two.
He is also currently chair of the board of the Defence Science and Technology Laboratory (Dstl), an MoD executive agency which performs science and technology work for defence purposes.
The Defence Science and Technology Laboratory (DSTL), an agency sponsored by the Ministry of Defence, set up to ensure that science and technological research contributes to the security of the UK, makes regular appearances.
The Defence Science and Technology Agency (DSTA) offers the DSTA Scholarships to support eligible students to pursue undergraduate education in a wide variety of courses in science and engineering.
Fellow, Defence Science and Technology Laboratory.
