Shellback

Official Navy leadership and management information in an easy-to-use app!

SeaWarrior Applications · com.tracen.doma

Not rated yet 10K+ downloads v3.0.18 82.8 MB Android 5.0+ PEGI 3 · Everyone

Download APK 82.8 MB All versions

Signature matches the Google Play version Details

At a glance

Latest version: v3.0.18 (213825)
Updated: Oct 10, 2026 (yesterday)
APK size: 82.8 MB
Requires: Android 5.0+ (API 21)
CPU support: ARM 32-bit, ARM 64-bit
Category: Books & Reference (app)
Listed since: Jun 25, 2022 (at least)
Permissions: 8 (2 sensitive)
Website: swsupport.tracen.com
Developer contact: [email protected]

About this APK

Shellback is an app by SeaWarrior Applications in the Books & Reference category, listed since at least June 2022. It includes native code for ARM 32-bit and ARM 64-bit, so it runs on practically every phone.

It asks for 8 permissions, 2 of them sensitive: read shared storage and modify shared storage. Compared with version 2.18.1.3, it adds 3 new permissions (“Foreground service media playback”, “Media content control” and “Run foreground services”) and drops 1 (“Prevent the device from sleeping”).

What's new in v3.0.18

-- Bug fixes and stability updates

Description

From the listing uploaded by “appupdater”.

What is the Shellback app? Shellback, formerly known as eDivo, is a free mobile app developed to support US Naval Surface Force (SURFOR) personnel in an easy-to-access offline environment. What is a Shellback? In naval tradition, a Shellback is a nickname for a Sailor who has crossed the Equator and thus transitioned from a novice Sailor, or Pollywog, to an experienced Sailor. Why do I need Shellback? Shellback provides Sailors the ability to download key SURFOR information on their own portable devices and access it while underway without the need for an internet connection. Shellback provides the most relevant and current information to SURFOR Sailors in one location. Content is scheduled for annual updates. What type of info can I find in Shellback? The information in Shellback is separated into several main categories: Admin/Training: Contains the Correspondence Manual and the SURFOR Training and Readiness Manual. Medical: Includes the Manual of the Medical Department, information on medical and physical readiness, mental health, Medical Evaluation Board procedures, the Disability Evaluation System, family member readiness, and more. Operations: Includes information and training on bridge management, navigation basics, watch team tools, crew endurance, operating procedures for air-capable ships, Air Certification for Naval Surface Force Ships, and manuals for amphibs, maintenance, and other general ship operation resources. Personnel Management: Provides documents on Navy personnel policy and administration. Also includes legal handbooks and manuals, resources for Surface Warfare Officers, and a variety of general personnel management resources. Safety: Provides documents related to lessons learned, mishap reporting, notices, safety-related awards, and general safety resources. Rules of the Road: This quiz tests a Sailor’s knowledge of maritime navigation rules.

Version history

3 versions are listed, going back to v2.11.9.

v3.0.18 LATEST Oct 10, 2026 82.8 MB TRUSTED v2.18.1.3 Aug 30, 2024 75.9 MB TRUSTED v2.11.9 Jun 5, 2024 75.9 MB TRUSTED

All 3 versions

Security & authenticity

Security rating: Trusted

Signing certificate

Signature matches the Google Play version Checked by the source store on Oct 10, 2026.
Certificate issued to “Tracen Technologies” This is the certificate of the Google Play version.
Same certificate as the 2 other versions checked

Store checks and file details

Developer signature verified Oct 10, 2026
Validated against Google Play Oct 10, 2026
Signed byCN=Android Developer, OU=Software Engineering, O=Tracen Technologies, L=Manassas, ST=VA, C=US
Signing certificate (SHA-1)08:D9:EF:28:07:9F:8C:8D:96:52:F5:CB:DC:1D:9C:D6:57:87:73:AA
File MD549bc3f3f68e8d9be245a61cc040105d9
Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020

Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (2 other versions compared). AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.

Permissions (8)

Shellback requests 8 permissions, 2 of them sensitive.

Modify shared storage Sensitive android.permission.WRITE_EXTERNAL_STORAGE
Read shared storage Sensitive android.permission.READ_EXTERNAL_STORAGE
Foreground service media playback android.permission.FOREGROUND_SERVICE_MEDIA_PLAYBACK
Full network access android.permission.INTERNET
Internal broadcast protection (app-defined) com.tracen.doma.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Media content control android.permission.MEDIA_CONTENT_CONTROL
Run foreground services android.permission.FOREGROUND_SERVICE
View network connections android.permission.ACCESS_NETWORK_STATE

Required hardware & features

Basic touch input android.hardware.faketouch

Shellback APK: questions and answers

How much space does Shellback need?

The APK is 82.8 MB, and the app also needs 137.8 MB of extra data (OBB files). Leave about 303.4 MB free for the installation.

Can I install this APK over the version I already have?

Yes, if your installed copy is older. It is signed like the Google Play version, so Android installs it as an update and keeps your data.

Is the Shellback APK safe?

No one can promise that a file is safe, but some things can be checked. The source store rates this file Trusted. Its signature matches the Google Play version. It is signed with the same certificate as the 2 other versions checked. After downloading, check that the file's MD5 is 49bc3f3f68e8d9be245a61cc040105d9.