This refers to forum signatures, which are automatically included at the bottom of forum posts.

If a soldier wishes to have content in the signature field, it may include no more than two images, and be no more than 200 characters. Text formatting and quote boxes are acceptable. All content should keep the forum rules in mind, which prohibit offensive remarks and images.
https://www.29th.org/wiki/Signature_Regulations
www.29th.org
crawl=CC-MAIN-2020-10
4737
application/http; msgtype=response
sha1:P6GEJBO4OSUOYQRLYLIBJAYHLEHP2FSX
<urn:uuid:44e8f3be-161a-4326-8e12-3fe1c97c9bec>
2020-02-18T19:30:21Z
174.138.125.211
text/html
sha1:7PKJKY4SQ62PBST5MGYIU3YGDLMHLB4O
<urn:uuid:f92136bc-2f64-4099-8a68-fa8107b816ed>
https://www.29th.org/wiki/Signature_Regulations
response
<urn:uuid:eec0414c-46a2-401f-98e6-462f3bb131df>
isPartOf: CC-MAIN-2020-10
publisher: Common Crawl
description: Wide crawl of the web for February 2020
operator: Common Crawl Admin (info@commoncrawl.org)
hostname: ip-10-67-67-179.ec2.internal
software: Apache Nutch 1.16 (modified, https://github.com/commoncrawl/nutch/)
robots: checked via crawler-commons 1.1-SNAPSHOT (https://github.com/crawler-commons/crawler-commons)
format: WARC File Format 1.1
conformsTo: http://iipc.github.io/warc-specifications/specifications/warc-format/warc-1.1/