Check the bottom of this page
http://indochine54.free.fr/cefeo/orgs.html#top
Groupement Amphibie (1954) of course it's not the definitive version
.
Another source but in french about the FFL tank regiment (REC) in Indochina.
http://www.2eme-rep-more-majorum.com...age_crabes.htm
7/7/47 2 Squadrons
9/1/51 3 amphib units 'called sous-groupement and i have no idea about the size)
10/1/51 3 more amphib units
7/22/54 official creation of a amphib "squadron".