# Helios revision history

Append-only Arc G field-change log. Forward-only honesty: events accrue from Arc G adoption.

Model: [Helios](/models/helios.md)

## Recorded posture

- First recorded event: 2026-06-07
- Last material change: 2026-06-07
- Material event count: 1
- Editorial event count: 0

## Material events (1)

- **2026-06-07**: created (source: [{"url":"https://www.ses.com/press-release/ses-signs-multi-launch-agreement-helios-transport-services-impulse-space","title":"SES Signs Multi-Launch Agreement for Helios Transport Services with Impulse Space","sourceName":"SES (primary)"}]) (verified)

## Forward-only note

Arc G is forward-only. The event log accrues from the Arc G adoption point. Fields with no events post-baseline equal the current cached value and are not independently verified at any prior date. To restate a recorded change, write a new event through the updateEntityField chokepoint.

_Canonical URL: /models/helios/history. REST: /v1/models/29eaa53c-0c80-4c11-bc35-5adf73c33116/history. HTML: [/models/helios/history](/models/helios/history)._