This appears to be a variant of the 9S dump of House of the Dead 2. This is from the "Sega All Stars" version of the game.
Title: THE HOUSE OF THE DEAD 2 Media ID: BD74 Media Config: GD-ROM1/1 Regions: U Peripheral String: 4799A10 Product Number: MK-51002 Version: V1.001 Release Date: 19990728 Manufacturer ID: SEGA ENTERPRISES Ring Code: *12S* 51002 Mastering SID: B IFPI L433 Toolstamp: A4
Hardware: Dreamcast HKT-3020 with BBA and httpd-ack v20071123
Title: THE HOUSE OF THE DEAD 2 Media ID: BD74 Media Config: GD-ROM1/1 Regions: U Peripheral String: 4799A10 Product Number: MK-51002 Version: V1.001 Release Date: 19990728 Manufacturer ID: SEGA ENTERPRISES Inner Ring Code: IFPI 7480 Outer Ring Code: *12S* 51002 B A1 IFPI L433
Hardware: Dreamcast USA HKT-3020 (1) with Broadband HIT-0400 Software: httpd-ack-20080711 on Windows 10 with Chrome, and custom PowerShell script
Disc verified and added to the dats. Thank you both for submitting it!
Still unverified variants are the *9S* 51002 linked on the first post above and a rather intriguing disc with ringcode MK-51002 1MM1 C 98. This is japanese style ringcode, quite possibly from an early batch of the game before manufacture started in US plants.