NOTE: I made this on a game that includes the altered sprites from the Miranda Class (In the thread called 'Help with Importing ships'), I am not sure if it works without those altered sprite files.

//*********************************************************************************************************
Copy all folders in the game Directory (for example: C:\Program Files\Activision\Star Trek Armada II Fleet Operations 3.0\Data)

//*********************************************************************************************************
Open 'Dynamic_Localized_Strings' and look for

"FEDERATION-EXCELSIOR-ARRIVED", "An Excelsior Class vessel responded to your distress call",

beneath it, add:

"FEDERATION-CONSTITUTION-ARRIVED", "A Constitution Class vessel responded to your distress call",

then find:

",
"AUTOTOOLTIP-fed_defiant.odf", "
     Offensive Value
     Defensive Value
     System Value

     2x Rapid Fire Pulse Phaser
     Critical Shot

      Short
",

and add above it:

",
"AUTOTOOLTIP-fed_constitution.odf", "
     Offensive Value
     Defensive Value
       System Value

     Phaser
     Photon Torpedo

      Long
",
"AUTOTOOLTIP-fed_constitutionr2.odf", "
     Offensive Value
     Defensive Value
       System Value

     Phaser
     Photon Torpedo

      Long
",
"AUTOTOOLTIP-fed_constitutionr3.odf", "
     Offensive Value
     Defensive Value
       System Value

     Phaser
     Photon Torpedo

      Long
",
"AUTOTOOLTIP-fed_constitutionr4.odf", "
     Offensive Value
     Defensive Value
       System Value

     Phaser
     Photon Torpedo
     Field Command 
     This vessel no longer counts towards
     the Warp-In limitation

      Long
",
"AUTOTOOLTIP-fed_constitutionr5.odf", "
     Offensive Value
     Defensive Value
       System Value

     Phaser
     Photon Torpedo
     Field Command 
     This vessel no longer counts towards
     the Warp-In limitation
     Weaponry Refit 
     Fires an additional photon torpedo for
     each   available

      Long
",
"AUTOTOOLTIP-fed_constitutionr6.odf", "
     Offensive Value
     Defensive Value
       System Value

     Phaser
     Photon Torpedo
     Field Command 
     This vessel no longer counts towards
     the Warp-In limitation
     Weaponry Refit 
     Fires an additional photon torpedo for
     each   available
     Experimental Engines
     Engine Speed greatly increased

      Long
",

//*********************************************************************************************************
Open 'Events' and look for

FederationWarpinExcelsior{
Text "FEDERATION-EXCELSIOR-ARRIVED"
SaveLocation
Global
Marker radius 32 shrink 0.05 time 1 color 0 1 0
}


add beneath it:


FederationWarpinConstitution{
Text "FEDERATION-CONSTITUTION-ARRIVED"
SaveLocation
Global
Marker radius 32 shrink 0.05 time 1 color 0 1 0
}


//*********************************************************************************************************
Open 'gui_global' and look for

all_alliedrepairw5	wireframe10	96	96	96	96		#		

add beneath it:

fed_freedomw5	wireframetyler	0	0	96	96		#		
fed_cheyennew5	wireframetyler	96	0	96	96		#	
fed_constitutionw5	wireframetyler	192	0	96	96		#		

THIS IS FOR PEOPLE WHO WANT TO USE THESE AS BUILDABLE SHIPS - IGNORE OTHERWISE

Look for:

b_fed_ambassador	federationbuttons04	258	3	80	80		#	4	1

add beneath it:

b_fed_cheyenne	federationbuttonstyler	88	3	80	80		#	2	1
b_fed_freedom	federationbuttonstyler	3	3	80	80		#	1	1
b_fed_constiution	federationbuttonstyler	173	3	80	80		#	3	1
b_fed_centaur	federationbuttonstyler	258	3	80	80		#	4	1