Apart from being one of the founders of the Aeroclub of Lithuania, Kalmantas had a significant role in commanding a contingent of Lithuanian soldiers during the Klaipėda Revolt of 1923.

[1] Mykolas Kalmantas was born on 18 October 1895 in the village of Mėčionys [lt], then belonging to the Vilna Governorate of the Russian Empire, to Matas Kalmantavičius and Anelė Kalmantavičienė née Kuodytė.

[2] After the unit was disbanded, Kalmantas returned to Lithuania and for some time worked for the Vilija company's workshop office in Vilnius.

[3] On 3 July 1919 Kalmantas was mobilized into the Lithuanian Army and assigned to the Ukmergė Infantry Battalion's 2nd Company as a junior officer.

As was the customary reward for people serving in the army during the Lithuanian Wars of Independence, Kalmantas received land in the village of Beržai near Jonava.

After signing up as a volunteer for the march to Klaipėda, the SCSLM was notified about Kalmantas being made the commander of the second group of rebels under the codename of Mikas Bajoras.

From 9 to 22 January 1923, Kalmantas commanded his contingent in taking over the Pagėgiai city and district; Jonas Budrys, one of the most important military intelligence figures in the revolt, reported Kalmantavičius's activity as follows:"<...> Mikas Kalmatavičius (Bajoras) was appointed the commander of the 2nd group with the task of occupying the Pagėgiai county and establishing himself in the Tilžė district, which he fulfilled at the appointed time."

In July 1923, Kalmantas was awarded the Order of the Cross of Vytis, 1st degree, for "bravery and cleverness during the operation of the liberation of Klaipėda".

[8][2] A reform in 1935 made it so the Union was directly subordinate to the Chief of Defence of Lithuania, integrating it closer with the Lithuanian defensive structure.

[3] After his resignation, Kalmantas was elected a member of the council of elders of the Kaunas Garrison Officers' Club, as well as the President Antanas Smetona's secretary.

On the same day, Kalmantas was appointed as the deputy head of the armaments board of the Kaunas war command, which was just formed by order of the Provisional Government of Lithuania.

In summer of 1944 he moved to Germany, however on 29 August he returned and was appointed the head of the press and education department of the headquarters of the Fatherland Defense Force.

After the Battle of Seda, having lost contact with his family, Kalmantas moved to the Allied-occupied zones in Western Germany.

[3] In 1948 Kalmantas emigrated to the United States and settled in Chicago,[2] a city with a significant population of Lithuanian émigrés.

Although Soviet authorities claimed that they were in possession of his medals and a parade sword on which his Klaipėda Revolt codename Bajoras was inscribed, all of the items were lost.