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Images don't get cached.

I run an automotive forum, and as you can imagine it has a lot of images in the posts.

They don't get cached by Chrome.

My .htacess

# Mod_security can interfere with uploading of content such as attachments. If you
# cannot attach files, remove the "#" from the lines below.
#<IfModule mod_security.c>
# SecFilterEngine Off
# SecFilterScanPOST Off

ErrorDocument 401 default
ErrorDocument 403 default
ErrorDocument 404 default
ErrorDocument 500 default

<IfModule mod_rewrite.c>
RewriteEngine On

# If you are having problems with the rewrite rules, remove the "#" from the
# line that begins "RewriteBase" below. You will also have to change the path
# of the rewrite to reflect the path to your XenForo installation.
#RewriteBase /xenforo

# This line may be needed to enable WebDAV editing with PHP as a CGI.
#RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -l [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^.*$ - [NC,L]
RewriteRule ^(data/|js/|styles/|install/|favicon\.ico|crossdomain\.xml|robots\.txt) - [NC,L]
RewriteRule ^.*$ index.php [NC,L]

# Headers expires

Header unset Pragma
FileETag None
Header unset ETag

# 1 YEAR
<FilesMatch "\.(ico|pdf|flv)$">
Header set Cache-Control "max-age=29030400, public"
# 1 WEEK
<FilesMatch "\.(jpg|jpeg|png|gif|swf)$">
Header set Cache-Control "max-age=604800, public"
# 2 DAYS 172800
<FilesMatch "\.(xml|txt|css|js)$">
Header set Cache-Control "max-age=604800, proxy-revalidate"
# 1 MIN
<FilesMatch "\.(html|htm)$">
Header set Cache-Control "max-age=60, private, proxy-revalidate"
ExpiresActive on
ExpiresByType image/jpeg "access plus 1 months"
ExpiresByType image/jpg "access plus 1 months"

Bue the jpg-jpeg headers shows that it expires in 1981 (?):

HTTP/1.1 200 OK Date: Fri, 01 Jun 2012 11:25:09 GMT Server: Apache/2.2.20 (Ubuntu) X-Powered-By: PHP/5.3.6-13ubuntu3.7 Expires: Thu, 19 Nov 1981 08:52:00 GMT Cache-control: private, max-age=0 Last-Modified: Fri, 01 Jun 2012 11:25:09 GMT Content-Disposition: inline; filename="DSC_0046.jpg" Content-Length: 50189 X-Content-Type-Options: nosniff Keep-Alive: timeout=5, max=96 Connection: Keep-Alive Content-Type: image/jpeg