Umar Arshad, 24, was jailed for six years and nine months and Syed Farhan Hussain, 22, for five years and three months for their roles in preparing for the terrorist attack at a Territorial Army centre.
The men, all from Luton, admitted one count of engaging in conduct in preparation for acts of terrorism between January 1 2011 and April 25 2012 at a hearing on March 1.
The men were arrested following a series of raids at their homes in April last year after an intelligence-led joint operation by the Metropolitan Police Counter Terrorism Command and the British Security Service (BSS).
More top news
A review has launched over concerns about the pregnancy test drug Primodos, vaginal mesh implants and anti-epilepsy drug sodium valproate.
The preacher was a counsellor to American presidents and become one of the most widely heard Christian evangelist in history.
An blast of cold air from the east could see the UK's coldest spell since 2013.