The southern port city has been the headquarters of forces loyal to President Abedrabbo Mansour Hadi and his backers in a Saudi-led military coalition but has seen growing violence by IS and its jihadist rival Al-Qaeda.
"A man detonated his explosive vest among soldiers," a military source said.
The troops were attending a training session run by Sudanese forces of the Saudi-led coalition, another military source said.
The bomber, who was disguised as a soldier, attacked the Ras Abbas camp in the west of Aden.
Since March last year, when the Saudi-led coalition intervened in support of Hadi, IS has ramped up its operations in Yemen.
Its rival Al-Qaeda also has a significant presence, expanding its presence in the south and southeast.
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