Template:Flag of the British Secretary of State for Defence

Current flag of the British Secretary of State for Defence part of the British Army, note this is the official up too date flag of the corps.

{{Flag of the British Secretary of State for Defence
|size=35px
}}

result:

{{Flag of the British Secretary of State for Defence
|size=25px
}}

result:

{{Flag of the British Secretary of State for Defence}}

result:

When too use 35

Specifically when it is the main topic, like if it is the main belligerent in a war or in a infobox only linking too it.

When it is a sub-participant of a war, i.e not the main nation.