Greetings,
SDA church supports non-combatancy of its members in service. It however leaves the decision to the individuals.
Here is what the bible says on this subject...
Ephesians 6:12 For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places.
Matthew 26
51 And, behold, one of them which were with Jesus stretched out his hand, and drew his sword, and struck a servant of the high priest's, and smote off his ear. 52 Then said Jesus unto him, Put up again thy sword into his place: for all they that take the sword shall perish with the sword.
Matthew 5:44 But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you;
Take the nation of Israel in the OT for example, its strength lied not in its army, but in the relationship with the Lord. When it had complete trust and dependence on God, it defeated the mighty Egyptian army without firing a single arrow.
However one can serve in the army without carrying weapons. So if this has been a dream of yours, don't let anyone's opinion discourage you. Let God alone convict your heart of what you should do.