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
Children whose parents have divorced are driven to drink or drugs, new research suggests.
Paul Gascoigne has spoken about his ongoing battle with alcoholism, admitting that "the only person who can save me is me".
A quick text can have serious long-term implications for a mobile phone users' spine, experts have warned.