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Baptised Jehovah’s Witnesses who join the military are at risk of being disfellowshipped, which results in being shunned by all Witnesses, including family members. Disfellowship Offences, found in the 2011 edition of the Elder’s Manual ‘Shepherd the Flock of God’ include:
No 2 – Apostasy which includes rebellion against Jehovah’s organization – Watchtower 63 7/1
No 19 – Non-neutral activities (involvement in politics and the military) – Pay Attention to Yourselves and to All the Flock (ks91-E) p.96
No 20 – Military service and non-military service including working casual work – Pay Attention to Yourselves and to All the Flock (ks91-E) p.96
However, certain civilian work within military organisations has been made a matter of conscience (1996 Watchtower 5/1 p.20).
Although the official line is that they "do not interfere with those who choose to serve in the armed forces”, that does not apply to baptised Witnesses. Taking up arms, going to war and taking life would be considered a serious sin which is a disfellowship offence for baptised Witnesses.