Desertion

n. abandonment; act of leaving the army without permission

In military terminology, desertion is the abandonment of one's duty or post without permission.
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Noun
1. withdrawing support or help despite allegiance or responsibility; "his abandonment of his wife and children left them penniless"
(synonym) abandonment, defection
(hypernym) withdrawal
(hyponym) abscondment, decampment
(derivation) abandon, forsake, desolate, desert
2. the act of giving something up
(synonym) abandonment, forsaking
(hypernym) rejection
(hyponym) exposure
(derivation) defect, desert

n. desertion, abandonment; act of leaving the army without permission

n. desertion