Question:
May a soldier or sailor who is on lonely outpost duty for a considerable period of time (as for example, men on coast guard duty) in the event of Yahrzeit say Kaddish alone, since he cannot possibly assemble a minyan?
Answer:
Just as in the case of the tefillah it is preferable to say it with the congregation and yet it is permitted to be said silently alone, so the Kaddish which is primarily part of the congregationwl response may also be recited silently alone.
Furthermore, the CANRA will arrange for Kaddish to be recited in a congregation in honor or the departed relative of any soldier or sailor who writes in to CANRA or makes such arrangement with the chaplain. The soldier or sailor should report the date of the Yahrzeit and the name of the relative.