One of my colleagues passed the jncia security exam late last year.
In looking at the website I do not see any reference to a jncia security exam - just the jncia-junos exam. While I am looking for certification re our Junos based SRX's the only certification i see described on the website is the jncia-junos test which covers many advanced routing topics.
Has the exam structure changed or is the web site just brain dead?
All of the JNCIA exams were combined into the same JNCIA-Junos exam as the first step. Only at the specialist level do the track specific items kick in. The JNCIA-Junos is a required first step for any of the Junos based tracks.
For the Security track this diagram shows the progression and supporting courses.