Here are some battle name options based on your input:

Strong & Serious, Emphasizing Robot Extermination:

• Rex Machina
• Steelbane
• Automaton's Bane
• Cyber Slayer
• Mech Destroyer
• Ironclad Fist
• Titanfall
• Codex Breaker
• Null Terminator
• System Purge

Strong & Serious, Human-Focused:

• Captain Valerius
• Sergeant Steel
• Commander Theron
• Major Havoc
• General Kestrel
• Colonel Ironside
• Sergeant Major Rex
• Lieutenant Zenith
• Captain Andromeda
• Commander Orion

Strong & Serious, Combining Human & Robot Extermination:

• Human-Mech Exterminator
• Valerius, the Robot Slayer
• Theron's Iron Purge
• Kestrel's Steel Storm
• Andromeda's Cyber War
• Orion's Mechanical Fall

More Evocative & Thematic Names:

• The Last Bastion
• The Iron Verdict
• The Steel Dawn
• The Cyber Purge
• The Mechanical Reckoning
• The Digital Tomb
• The Chrome Apocalypse
• The Circuit Breaker

These names aim for a serious tone and incorporate elements of space, soldiering, robot extermination, and a strong, human-centric feel. The variety offers options with different levels of directness and evocative imagery. Consider which best fits the specific context of your project.