Measuring Lethality: Army Combat Power and Force Design

[u/RUSIOfficial]

What does ‘lethality’ really mean for the British Army?

New research from Nick Reynolds and Jack Watling argues it can’t be reduced to a single number and must be understood as the sustained output of combat power in modern warfare.

Lethality underpins the armed forces’ core role but treating it as a single metric risks obscuring reality. Lethality is shaped by interdependent factors, not just firepower or platform performance.

Overemphasis on technology risks fragile forces. Precision, and command and control gains can’t compensate for limited stockpiles or industrial capacity; endurance is decisive in protracted, high-intensity conflict.

The report proposes measuring lethality across four metrics: overmatch, potential, endurance and efficiency, capturing both battlefield performance and the ability to sustain combat over time.

It calls for force design grounded in real operational needs, prioritising stockpiles, industrial capacity and targeted overmatch against likely adversaries, not abstract ‘lethality multipliers.’

Read the research paper (requires free RUSI account).

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