You can apply for a new US passport or passport renewal and a US passport card at the same time. This is a convenient option for frequent travelers to have both a valid passport for air travel and a passport card for travel to these destinations by land or sea.
As for when you should use a Seal... use Master Seals on non-promoted classes at level 10 to upgrade them, and Second Seals on non-promoted classes at 10 to switch them over to another class tree (mostly worthless, though switching characters that have access to Mercenary, such as the Avatar, over to it ASAP is generally a good idea), or to switch a promoted class into another promoted class at level 15.
1 With a RSA key you can nominally use the RSA and DHE_RSA cipher suite. 2  But if the server certificate has a Key Usage extension which does not include the keyEncipherment flag, then you are nominally limited to DHE_RSA. 3  With a DSA key you can use only a DHE_DSS cipher suite. With a DSA key you can use only a DHE_DSS cipher suite. 2  With a Diffie-Hellman key, you can use only one of DH_RSA or DH_DSS, depending on the issuing certificate authority key type.