Which of the following indicates a need to remove straps from service?

Removing straps from service is critical for ensuring safety during rigging practices. A visible red insert indicates that the strap has been damaged and may no longer meet safety standards. The red insert is typically a warning sign that the integrity of the strap is compromised, indicating a need to replace it to prevent possible failure under load.

While options related to color fading, minor wear and tear, and missing labels might suggest a need for inspection or maintenance, they do not necessarily indicate immediate removal from service. Color fading might affect visibility but does not inherently compromise the strap's strength. Minor wear and tear could be typical in straps that are still safe to use unless it reaches a more severe condition. Missing labels might affect identification and compliance verification but does not directly imply the strap's structural integrity is compromised like a visible red insert does. Thus, when you see a red insert, it is a clear and definitive reason for removal, emphasizing the critical safety measures involved in rigging practices.