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The Definitive Source for Everything CAC

Common Access Card help for your
Personal Computer

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(Everyone other than Marines look here)

Installation Steps

Step 1: Obtain a CAC Reader
Step 2: CAC Reader driver | Video
Step 3: DoD Certificates | Video
Step 4: ActivClient
Step 4a: Update ActivClient
Step 5:  IE adjustments | Video
Log into a CAC enabled website now to test
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The download link below requires you to login with your CAC first


Windows 8 users click here for information on how to use your CAC on your computer.

DO NOT follow instructions below



ActivClient [works with Windows 7, Vista, & XP] is available for download through the MCNOSC (Marine Corps Network Operations and Security Center) website:

You will be prompted for your CAC certificate & PIN immediately. 


ActivClient 6.2 software update


NOTE:  You have to download the software from [an already] CAC enabled computer, Save it to a CD and take to your computer.  You may want to try LPS if you don't have access to a CAC enabled computer.



If your CAC a "GEMALTO TOP DL GX4 144," "GEMALTO DLGX4-A 144," "Oberthur ID One 128 v5.5 Dual", or "G&D FIPS 201 SCE 3.2" you "may" be able to use your CAC without needing to install ActivClient. 

Another guide to help figure out which CAC you have

Read more about the older CACs and how to replace them

Gemalto Top GL 144 CAC image GemaltoDLGX4-A 144 imageOberthur 5.5 CAC image G&D FIPS 201 SCE 3.2

Make sure you download the correct version of ActivClient that matches your computer operating system... If you are unsure whether you have a 32 or 64 bit version, here is how to find out:


Windows 7, 8, & Vista, Right click Computer, select Properties.  Under System, System type you'll see 32 or 64 bit.  
XP, Right click My Computer, select Properties.  If it doesn't say 64 bit, you have a 32 bit Operating System. 


Here are more options for you (if the above don't work)





 If you have questions or suggestions for this site, contact Michael J. Danberry

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Last Update or Review:  Sunday, 15 February 2015 11:45 hrs


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