his or her state will use the suffix P.E. (P.Eng in Canada), Certified Professional Geologists use P.G., Certified Professional Logisticians use CPL, and Chartered Engineers use CEng. Likewise, Registered Architects sometimes use the suffix R.A., or more often a suffix such as AIA or RIBA that refers to their professional society. Examination Office personnel within the United Kingdom who are registered with the Examination Officers' Association use MEOA. In the United States, professional archaeologists registered with the Register of Professional Archaeologists use the suffix RPA. Project managers that have obtained certification as Project Management Professionals from the Project Management Institute may use the suffix PMP after their name. Similarly, individuals who hold certifications in the field of information security – e.g. CISA, CISSP, and/or CISM – may use them as suffixes. The suffix PT is used by Physical Therapists to denote their state certification, but not to be confused with DPT (Doctor of Physical Therapy) which is a qualifying degree. UK physiotherapists prefer to use MCSP or SRP to denote membership to professional bodies. RN is used by qualified nurses as a suffix. Officers and enlisted in the United States Military will add an abbreviation of the service frequently to disambiguate seniority, and reserve status. For example, Captain Smith, USN (O-6), outranks Captain Jones, USMC (O-3). Red Seal certified trades people in Canada can use the Red Seal Endorsement (RSE) acronym. Religious orders Members of religious institutes commonly use their institute's initials as a suffix. For example, a Franciscan friar uses the post-nominal initials "O.F.M.", derived from the Order's name in Latin, "Ordo Fratrum Minorum" (Order of Friars Minor). Equally, a Viatorian priest uses the suffix "C.S.V." from the name of his religious institute, "Clerici Santi Viatori", the (Clerics of Saint Viator). These initials are not considered by members of religious institutes as an equivalent to academic or honorary post-nominial initials, but rather as a sign of membership in a particular religious lineage, similar to the use of "Senior" or "Junior". Ordering In some English-speaking countries, the arrangement of post-nominal letters is governed by rules of precedence, and this list is sometimes called the "Order of Wear" (for the wearing of medals). Generational titles Generational suffixes are used to distinguish persons who share the same name within a family. A generational suffix can be used informally (for disambiguation purposes or as nicknames) and is often incorporated in legal documents. United