demobilize
Concise Oxford English Dictionary © 2008 Oxford University Press:
demobilize /dɪˈməʊbəlʌɪz/ (or demobilise /diːˈməʊbɪlʌɪz/)
▶verb take (troops) out of active service.
– derivatives
demobilization noun.
demobilization noun.
'demobilize' also found in these Oxford entries:

