When she holds back a man who tried to enter unchecked, he scowls at her and barks: "Woman and soldier?"
She did not respond but directed the man to the security checkpoint.
It's unusual to see a female in the military in traditionally conservative Somali society where women's duties are generally at home and limited to family chores. But Abdi and other determined women are breaking down those barriers.
About 1,500 females are now in the military of 20,000, according to estimates.
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"It was difficult, but I must do this to serve my country unreservedly," she said.
Her work as a soldier receives mixed reactions from her fellow Somalis. A few approve, but many think women should not be in the military.
Somali army officials report female army recruits have increased following the ouster from the capital in 2011 of the Islamic extremist rebels of al-Shabab. Order is slowly being restored in Somalia following more than 20 years of chaos and violence.
Somalia's state largely collapsed after a dictator was overthrown in 1991 and the country was run by feuding clans and more recently by Islamic militants. With support from the UN and the African Union, Somali forces pushed the extremists of al-Shabab out of the capital.