Group of servicemen, many in trouble (5)

I believe the answer is:

cadre

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'group of servicemen' is the definition.
'cadre' can be an answer for 'group' (I've seen this before). I'm not sure about the 'of servicemen' bit.

'many in trouble' is the wordplay.
'many' becomes 'd'.
'in' indicates putting letters inside.
'trouble' becomes 'care'.
'd' put inside 'care' is 'CADRE'.

Can you help me to learn more?

(Other definitions for cadre that I've seen before include "team" , "Raced (anag) -- small inner group of activists" , "Group of key personnel" , "Nucleus of key personnel" , "Nucleus, corps" .)

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