Blackman served 21 years in the United States Army, earning a Bronze Star for combat action as a tank commander in Iraq.

[5] Blackman served in the United States Army for 21 years as a front line tank commander, and a sexual harassment and assault prevention Senior Program Manager specialist.

[7] From 2016 to 2018, he was the founder, President and Chief Executive Officer of WB Inclusion and Diversity Consulting Firm, LLC in Snowflake, Arizona.

"[9][12][10][13] Blackman also called the Black Lives Matter movement a "terrorist organization", likened it to the Ku Klux Klan and questioned whether police brutality existed.

[14] In 2022, Blackman said that he and his family were the victims of a racist smear campaign driven by the far-right website The Gateway Pundit over his refusal to support overturning the 2020 presidential election.

[15] He said that, after he gave an interview in which he argued that it would be unconstitutional for state legislators to "decertify" the results of the 2020 presidential election, his daughter received a text message calling him a racial epithet and a "RINO" (Republican in Name Only).