The belt of truth
Christ is the truth:
The Word became flesh and made his dwelling among us. We have seen his glory, the glory of the one and only Son, who came from the Father, full of grace and truth. John 1:14
Jesus answered, “I am the way and the truth and the life. No one comes to the Father except through me.
The Word of God is truth:
Sanctify them by the truth; your word is truth.
just as Christ loved the church and gave himself up for her to make her holy, cleansing[b] her by the washing with water through the word,
Speaking and living a life of truthfulness is the truth
Now that you have purified yourselves by obeying the truth so that you have sincere love for each other, love one another deeply, from the heart
1 Peter 1:22
Truth does several things for the Christian soldier.
The breastplate of righteousness
God made him who had no sin to be sin for us, so that in him we might become the righteousness of God.
2 Corinthians 5:21
For the grace of God has appeared that offers salvation to all people. It teaches us to say “No” to ungodliness and worldly passions, and to live self-controlled, upright and godly lives in this present age,
The sandals of the gospel
He said to them, “Go into all the world and preach the gospel to all creation.
For I am not ashamed of the gospel, because it is the power of God that brings salvation to everyone who believes: first to the Jew, then to the Gentile.