Kate Stewart, daughter of the Brigadier and head of the scientific research department, has a handheld device that can scan a body (picking up the Eleventh Doctor's twin hearts), and also serves as a communication device.
The computers at UNIT HQ can detect anomalies such as artron energy spikes, and can also access CCTV on the streets.
Speaking in an interview on the 2011 special edition DVD of Spearhead from Space, Sherwin claimed that he had created UNIT because he wanted to give some "considerable support" to the Doctor, "so that [Troughton] didn't have so many damn lines to learn each week".
however, the organisation continues to execute its mandate to investigate and combat alien activity.
The final appearance of UNIT during the original run of Doctor Who was the Seventh Doctor serial, Battlefield (1989).
as of the 21st century, UNIT has the authority to detain persons indefinitely without trial, appeal, outside contact or legal representation, as experienced by Toshiko Sato before she was recruited to work for the British government by the Torchwood Institute in a flashback in the Torchwood episode "Fragments" (2008).
The organisation was rearranged by Kate Stewart, the daughter of Brigadier Lethbridge-Stewart.
There is also mention of them using helicopters and tanks while testing the destructibility of the cubes.
"The Day of the Doctor" (2013) shows that the Tower of London base contains the Black Archive housing various alien technological devices that UNIT has salvaged over the years and kept hidden away.
In a 2014 interview with Doctor Who Magazine, script editor Terrance Dicks recalled that he was present at the "birth" of UNIT during the production of the Doctor Who serial The Invasion (1968).
He credited both scriptwriter and script editor Derrick Sherwin and producer Peter Bryant as having come up with the idea beforehand, claiming that they were testing the concept in The Invasion before it had become central to the show in the Doctor Who serial Spearhead from Space (1970).
Speaking in an interview on the 2012 DVD of the Doctor Who serial The Krotons (1968–69), Sherwin said that he wanted Doctor Who to be "down on Earth anyway, for credibility", and described UNIT as "the ideal vehicle" for this.