(CNN) The US Army has plenty of famous examples of generals who were brothers. But sisters? Now that's another story.

Maj. Gen. Maria Barrett and younger sister Brig. Gen. Paula Lodi became what the Army believes to be the first pair of sister generals.

Maj. Gen. Maria Barrett presenting Brig. Gen. Paula Lodi a beret with one-star rank insignia as a tribute to the history of women serving in the Army and the historic moment of sisters serving together as General Officers.

Because women sometimes change their last names after marriage, the Army would have had to look at every single woman general, as well as their siblings, to compare names and determine if they were sisters.

An Army spokesperson told CNN that it wasn't possible to do that.

"But since there haven't been that many women generals, it's a safe bet that they're the first," the spokesperson said.

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